78632345920 has 28 divisors (see below), whose sum is σ = 187243274484. Its totient is φ = 31452938240.

The previous prime is 78632345917. The next prime is 78632345951. The reversal of 78632345920 is 2954323687.

It can be written as a sum of positive squares in 2 ways, for example, as 38347038976 + 40285306944 = 195824^2 + 200712^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122862721 + ... + 122863360.

It is an arithmetic number, because the mean of its divisors is an integer number (6687259803).

Almost surely, 2^78632345920 is an apocalyptic number.

It is an amenable number.

78632345920 is an abundant number, since it is smaller than the sum of its proper divisors (108610928564).

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

78632345920 is a wasteful number, since it uses less digits than its factorization.

78632345920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245726098 (or 245726088 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 49.

The spelling of 78632345920 in words is "seventy-eight billion, six hundred thirty-two million, three hundred forty-five thousand, nine hundred twenty".