391477612680 has 512 divisors, whose sum is σ = 1630211788800. Its totient is φ = 81181440000.

The previous prime is 391477612657. The next prime is 391477612693. The reversal of 391477612680 is 86216774193.

391477612680 is a `hidden beast` number, since 3 + 9 + 14 + 7 + 7 + 612 + 6 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 43488180 + ... + 43497180.

It is an arithmetic number, because the mean of its divisors is an integer number (3184007400).

Almost surely, 2^391477612680 is an apocalyptic number.

391477612680 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391477612680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (815105894400).

391477612680 is an abundant number, since it is smaller than the sum of its proper divisors (1238734176120).

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

391477612680 is a wasteful number, since it uses less digits than its factorization.

391477612680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9562 (or 9552 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The spelling of 391477612680 in words is "three hundred ninety-one billion, four hundred seventy-seven million, six hundred twelve thousand, six hundred eighty".