400779102878 has 64 divisors (see below), whose sum is σ = 782361400320. Its totient is φ = 149308051200.

The previous prime is 400779102851. The next prime is 400779102917. The reversal of 400779102878 is 878201977004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11391218 + ... + 11426346.

It is an arithmetic number, because the mean of its divisors is an integer number (12224396880).

Almost surely, 2^400779102878 is an apocalyptic number.

400779102878 is a deficient number, since it is larger than the sum of its proper divisors (381582297442).

400779102878 is a wasteful number, since it uses less digits than its factorization.

400779102878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38393.

The product of its (nonzero) digits is 1580544, while the sum is 53.

The spelling of 400779102878 in words is "four hundred billion, seven hundred seventy-nine million, one hundred two thousand, eight hundred seventy-eight".