77969572478 has 16 divisors (see below), whose sum is σ = 136506000384. Its totient is φ = 32704562040.

The previous prime is 77969572423. The next prime is 77969572481. The reversal of 77969572478 is 87427596977.

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, 59246738 + ... + 59248053.

It is an arithmetic number, because the mean of its divisors is an integer number (8531625024).

Almost surely, 2^77969572478 is an apocalyptic number.

77969572478 is a deficient number, since it is larger than the sum of its proper divisors (58536427906).

77969572478 is a wasteful number, since it uses less digits than its factorization.

77969572478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118494847.

The product of its digits is 373403520, while the sum is 71.

The spelling of 77969572478 in words is "seventy-seven billion, nine hundred sixty-nine million, five hundred seventy-two thousand, four hundred seventy-eight".