681975180 has 48 divisors (see below), whose sum is σ = 2121702240. Its totient is φ = 181859904.

The previous prime is 681975167. The next prime is 681975193. The reversal of 681975180 is 81579186.

It is an interprime number because it is at equal distance from previous prime (681975167) and next prime (681975193).

It is a super-2 number, since 2×681975180² = 930180292272064800, which contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 630919 + ... + 631998.

It is an arithmetic number, because the mean of its divisors is an integer number (44202130).

Almost surely, 2^681975180 is an apocalyptic number.

681975180 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

681975180 is an abundant number, since it is smaller than the sum of its proper divisors (1439727060).

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

681975180 is a wasteful number, since it uses less digits than its factorization.

681975180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262935 (or 1262927 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 45.

The square root of 681975180 is about 26114.6545066175. The cubic root of 681975180 is about 880.2165359014.

The spelling of 681975180 in words is "six hundred eighty-one million, nine hundred seventy-five thousand, one hundred eighty".