78745940646 has 16 divisors (see below), whose sum is σ = 157506412464. Its totient is φ = 26246225024.

The previous prime is 78745940593. The next prime is 78745940653. The reversal of 78745940646 is 64604954787.

It is a self number, because there is not a number n which added to its sum of digits gives 78745940646.

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, 534375 + ... + 665618.

It is an arithmetic number, because the mean of its divisors is an integer number (9844150779).

Almost surely, 2^78745940646 is an apocalyptic number.

78745940646 is an abundant number, since it is smaller than the sum of its proper divisors (78760471818).

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

78745940646 is a wasteful number, since it uses less digits than its factorization.

78745940646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1210935.

The product of its (nonzero) digits is 40642560, while the sum is 60.

The spelling of 78745940646 in words is "seventy-eight billion, seven hundred forty-five million, nine hundred forty thousand, six hundred forty-six".