649620 has 60 divisors (see below), whose sum is σ = 2042964. Its totient is φ = 172800.

The previous prime is 649619. The next prime is 649631. The reversal of 649620 is 26946.

649620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 492804 + 156816 = 702^2 + 396^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×649620² = 844012288800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649620.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1420 + ... + 1820.

2⁶⁴⁹⁶²⁰ is an apocalyptic number.

649620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1021482).

649620 is an abundant number, since it is smaller than the sum of its proper divisors (1393344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649620 is a wasteful number, since it uses less digits than its factorization.

649620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422 (or 411 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 649620 is about 805.9900743806. The cubic root of 649620 is about 86.6070266866.

The spelling of 649620 in words is "six hundred forty-nine thousand, six hundred twenty".