421516778928 has 80 divisors (see below), whose sum is σ = 1244661169920. Its totient is φ = 120415650048.

The previous prime is 421516778867. The next prime is 421516778941. The reversal of 421516778928 is 829877615124.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2286451 + ... + 2463917.

It is an arithmetic number, because the mean of its divisors is an integer number (15558264624).

Almost surely, 2^421516778928 is an apocalyptic number.

421516778928 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

421516778928 is an abundant number, since it is smaller than the sum of its proper divisors (823144390992).

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

421516778928 is a wasteful number, since it uses less digits than its factorization.

421516778928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184554 (or 184548 counting only the distinct ones).

The product of its digits is 13547520, while the sum is 60.

The spelling of 421516778928 in words is "four hundred twenty-one billion, five hundred sixteen million, seven hundred seventy-eight thousand, nine hundred twenty-eight".