1649919536 has 40 divisors (see below), whose sum is σ = 3350571264. Its totient is φ = 785576000.

The previous prime is 1649919517. The next prime is 1649919553. The reversal of 1649919536 is 6359199461.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73661 + ... + 93411.

Almost surely, 2^1649919536 is an apocalyptic number.

1649919536 is a gapful number since it is divisible by the number (16) 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 1649919536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1675285632).

1649919536 is an abundant number, since it is smaller than the sum of its proper divisors (1700651728).

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

1649919536 is a wasteful number, since it uses less digits than its factorization.

1649919536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20009 (or 20003 counting only the distinct ones).

The product of its digits is 1574640, while the sum is 53.

The square root of 1649919536 is about 40619.2015677315. The cubic root of 1649919536 is about 1181.6465417607.

The spelling of 1649919536 in words is "one billion, six hundred forty-nine million, nine hundred nineteen thousand, five hundred thirty-six".