681412764 has 24 divisors (see below), whose sum is σ = 1591488640. Its totient is φ = 226919664.

The previous prime is 681412741. The next prime is 681412783. The reversal of 681412764 is 467214186.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 13954 + ... + 39465.

Almost surely, 2^681412764 is an apocalyptic number.

It is an amenable number.

681412764 is an abundant number, since it is smaller than the sum of its proper divisors (910075876).

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

681412764 is a wasteful number, since it uses less digits than its factorization.

681412764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54489 (or 54487 counting only the distinct ones).

The product of its digits is 64512, while the sum is 39.

The square root of 681412764 is about 26103.8840788110. The cubic root of 681412764 is about 879.9745016717.

The spelling of 681412764 in words is "six hundred eighty-one million, four hundred twelve thousand, seven hundred sixty-four".