67649 has 4 divisors (see below), whose sum is σ = 68820. Its totient is φ = 66480.

The previous prime is 67631. The next prime is 67651. The reversal of 67649 is 94676.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1600 + 66049 = 40^2 + 257^2 .

It is a cyclic number.

It is not a de Polignac number, because 67649 - 2¹⁶ = 2113 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494 + ... + 615.

It is an arithmetic number, because the mean of its divisors is an integer number (17205).

2⁶⁷⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

67649 is a deficient number, since it is larger than the sum of its proper divisors (1171).

67649 is a wasteful number, since it uses less digits than its factorization.

67649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170.

The product of its digits is 9072, while the sum is 32.

The square root of 67649 is about 260.0942136996. The cubic root of 67649 is about 40.7462013597.

It can be divided in two parts, 676 and 49, that multiplied together give a square (33124 = 182²).

The spelling of 67649 in words is "sixty-seven thousand, six hundred forty-nine".