681334408 has 8 divisors (see below), whose sum is σ = 1277502030. Its totient is φ = 340667200.

The previous prime is 681334397. The next prime is 681334421. The reversal of 681334408 is 804433186.

It can be written as a sum of positive squares in only one way, i.e., 481451364 + 199883044 = 21942^2 + 14138^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42583393 + ... + 42583408.

Almost surely, 2^681334408 is an apocalyptic number.

It is an amenable number.

681334408 is a deficient number, since it is larger than the sum of its proper divisors (596167622).

681334408 is a wasteful number, since it uses less digits than its factorization.

681334408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85166807 (or 85166803 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 681334408 is about 26102.3831862150. The cubic root of 681334408 is about 879.9407708070.

The spelling of 681334408 in words is "six hundred eighty-one million, three hundred thirty-four thousand, four hundred eight".