32646432640 has 32 divisors (see below), whose sum is σ = 78045379560. Its totient is φ = 13058572800.

The previous prime is 32646432601. The next prime is 32646432649. The reversal of 32646432640 is 4623464623.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 32646432593 and 32646432602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32646432649) 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, 25504386 + ... + 25505665.

Almost surely, 2^32646432640 is an apocalyptic number.

It is an amenable number.

32646432640 is an abundant number, since it is smaller than the sum of its proper divisors (45398946920).

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

32646432640 is an equidigital number, since it uses as much as digits as its factorization.

32646432640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51010070 (or 51010058 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 40.

The spelling of 32646432640 in words is "thirty-two billion, six hundred forty-six million, four hundred thirty-two thousand, six hundred forty".