681459940 has 48 divisors (see below), whose sum is σ = 1636992000. Its totient is φ = 233430912.

The previous prime is 681459931. The next prime is 681459959. The reversal of 681459940 is 49954186.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 282861 + ... + 285259.

It is an arithmetic number, because the mean of its divisors is an integer number (34104000).

Almost surely, 2^681459940 is an apocalyptic number.

It is an amenable number.

681459940 is an abundant number, since it is smaller than the sum of its proper divisors (955532060).

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

681459940 is a wasteful number, since it uses less digits than its factorization.

681459940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4444 (or 4442 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 681459940 is about 26104.7876834883. The cubic root of 681459940 is about 879.9948088537.

The spelling of 681459940 in words is "six hundred eighty-one million, four hundred fifty-nine thousand, nine hundred forty".