681505924 has 12 divisors (see below), whose sum is σ = 1301056848. Its totient is φ = 309775400.

The previous prime is 681505921. The next prime is 681505943. The reversal of 681505924 is 429505186.

It is not an unprimeable number, because it can be changed into a prime (681505921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7744342 + ... + 7744429.

It is an arithmetic number, because the mean of its divisors is an integer number (108421404).

Almost surely, 2^681505924 is an apocalyptic number.

It is an amenable number.

681505924 is a deficient number, since it is larger than the sum of its proper divisors (619550924).

681505924 is a wasteful number, since it uses less digits than its factorization.

681505924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15488786 (or 15488784 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 40.

The square root of 681505924 is about 26105.6684266080. The cubic root of 681505924 is about 880.0146020304.

It can be divided in two parts, 681 and 505924, that added together give a palindrome (506605).

The spelling of 681505924 in words is "six hundred eighty-one million, five hundred five thousand, nine hundred twenty-four".