681179940 has 72 divisors (see below), whose sum is σ = 2361428160. Its totient is φ = 155697984.

The previous prime is 681179911. The next prime is 681179959. The reversal of 681179940 is 49971186.

It is a happy number.

681179940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×681179940² = 928012221316807200, 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 polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 269050 + ... + 271569.

Almost surely, 2^681179940 is an apocalyptic number.

681179940 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

681179940 is an abundant number, since it is smaller than the sum of its proper divisors (1680248220).

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

681179940 is a wasteful number, since it uses less digits than its factorization.

681179940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540641 (or 540636 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 681179940 is about 26099.4241315781. The cubic root of 681179940 is about 879.8742675048.

The spelling of 681179940 in words is "six hundred eighty-one million, one hundred seventy-nine thousand, nine hundred forty".