78739404026 has 4 divisors (see below), whose sum is σ = 118109106042. Its totient is φ = 39369702012.

The previous prime is 78739404019. The next prime is 78739404031. The reversal of 78739404026 is 62040493787.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 54184200625 + 24555203401 = 232775^2 + 156701^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19684851005 + ... + 19684851008.

Almost surely, 2^78739404026 is an apocalyptic number.

78739404026 is a deficient number, since it is larger than the sum of its proper divisors (39369702016).

78739404026 is a wasteful number, since it uses less digits than its factorization.

78739404026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39369702015.

The product of its (nonzero) digits is 2032128, while the sum is 50.

The spelling of 78739404026 in words is "seventy-eight billion, seven hundred thirty-nine million, four hundred four thousand, twenty-six".