32656640 has 72 divisors (see below), whose sum is σ = 80844288. Its totient is φ = 12625920.

The previous prime is 32656627. The next prime is 32656667. The reversal of 32656640 is 4665623.

It is a super-2 number, since 2×32656640² = 2132912272179200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 32656597 and 32656606.

It is a congruent 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, 39269 + ... + 40091.

Almost surely, 2^32656640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 32656640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40422144).

32656640 is an abundant number, since it is smaller than the sum of its proper divisors (48187648).

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

32656640 is an equidigital number, since it uses as much as digits as its factorization.

32656640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875 (or 861 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 32656640 is about 5714.5988485632. The cubic root of 32656640 is about 319.6370885784.

The spelling of 32656640 in words is "thirty-two million, six hundred fifty-six thousand, six hundred forty".