78739440436 has 12 divisors (see below), whose sum is σ = 143785065312. Its totient is φ = 37657993208.

The previous prime is 78739440401. The next prime is 78739440467. The reversal of 78739440436 is 63404493787.

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, 427931650 + ... + 427931833.

It is an arithmetic number, because the mean of its divisors is an integer number (11982088776).

Almost surely, 2^78739440436 is an apocalyptic number.

It is an amenable number.

78739440436 is a deficient number, since it is larger than the sum of its proper divisors (65045624876).

78739440436 is a wasteful number, since it uses less digits than its factorization.

78739440436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855863510 (or 855863508 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 55.

The spelling of 78739440436 in words is "seventy-eight billion, seven hundred thirty-nine million, four hundred forty thousand, four hundred thirty-six".