78737009646 has 16 divisors (see below), whose sum is σ = 157609436544. Its totient is φ = 26223100344.

The previous prime is 78737009609. The next prime is 78737009699. The reversal of 78737009646 is 64690073787.

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, 5634826 + ... + 5648781.

It is an arithmetic number, because the mean of its divisors is an integer number (9850589784).

Almost surely, 2^78737009646 is an apocalyptic number.

78737009646 is an abundant number, since it is smaller than the sum of its proper divisors (78872426898).

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

78737009646 is a wasteful number, since it uses less digits than its factorization.

78737009646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11284775.

The product of its (nonzero) digits is 10668672, while the sum is 57.

The spelling of 78737009646 in words is "seventy-eight billion, seven hundred thirty-seven million, nine thousand, six hundred forty-six".