3931645536 has 432 divisors, whose sum is σ = 14509076400. Its totient is φ = 999806976.

The previous prime is 3931645489. The next prime is 3931645579. The reversal of 3931645536 is 6355461393.

3931645536 is a `hidden beast` number, since 3 + 9 + 31 + 64 + 553 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 3931645491 and 3931645500.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 5319855 + ... + 5320593.

It is an arithmetic number, because the mean of its divisors is an integer number (33585825).

Almost surely, 2^3931645536 is an apocalyptic number.

3931645536 is a gapful number since it is divisible by the number (36) 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 3931645536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7254538200).

3931645536 is an abundant number, since it is smaller than the sum of its proper divisors (10577430864).

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

3931645536 is a wasteful number, since it uses less digits than its factorization.

3931645536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811 (or 793 counting only the distinct ones).

The product of its digits is 874800, while the sum is 45.

The square root of 3931645536 is about 62702.8351512115. The cubic root of 3931645536 is about 1578.3068889937.

The spelling of 3931645536 in words is "three billion, nine hundred thirty-one million, six hundred forty-five thousand, five hundred thirty-six".