64581632 has 26 divisors (see below), whose sum is σ = 129155688. Its totient is φ = 32288768.

The previous prime is 64581617. The next prime is 64581653. The reversal of 64581632 is 23618546.

It is a junction number, because it is equal to n+sod(n) for n = 64581592 and 64581601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3788 + ... + 11979.

Almost surely, 2^64581632 is an apocalyptic number.

It is an amenable number.

64581632 is a deficient number, since it is larger than the sum of its proper divisors (64574056).

64581632 is an equidigital number, since it uses as much as digits as its factorization.

64581632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15791 (or 15769 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 64581632 is about 8036.2697814347. The cubic root of 64581632 is about 401.2080810108.

The spelling of 64581632 in words is "sixty-four million, five hundred eighty-one thousand, six hundred thirty-two".