681478920 has 96 divisors (see below), whose sum is σ = 2296869120. Its totient is φ = 181725120.

The previous prime is 681478901. The next prime is 681478943. The reversal of 681478920 is 29874186.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25336 + ... + 44775.

It is an arithmetic number, because the mean of its divisors is an integer number (23925720).

Almost surely, 2^681478920 is an apocalyptic number.

681478920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

681478920 is an abundant number, since it is smaller than the sum of its proper divisors (1615390200).

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

681478920 is a wasteful number, since it uses less digits than its factorization.

681478920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70137 (or 70121 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 681478920 is about 26105.1512158041. The cubic root of 681478920 is about 880.0029786401.

The spelling of 681478920 in words is "six hundred eighty-one million, four hundred seventy-eight thousand, nine hundred twenty".