681764902 has 16 divisors (see below), whose sum is σ = 1258643232. Its totient is φ = 269709120.

The previous prime is 681764899. The next prime is 681764921. The reversal of 681764902 is 209467186.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1872799 + ... + 1873162.

It is an arithmetic number, because the mean of its divisors is an integer number (78665202).

Almost surely, 2^681764902 is an apocalyptic number.

681764902 is a deficient number, since it is larger than the sum of its proper divisors (576878330).

681764902 is a wasteful number, since it uses less digits than its factorization.

681764902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3745983.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 681764902 is about 26110.6281425783. The cubic root of 681764902 is about 880.1260589042.

The spelling of 681764902 in words is "six hundred eighty-one million, seven hundred sixty-four thousand, nine hundred two".