681693902 has 4 divisors (see below), whose sum is σ = 1022540856. Its totient is φ = 340846950.

The previous prime is 681693889. The next prime is 681693967. The reversal of 681693902 is 209396186.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170423474 + ... + 170423477.

It is an arithmetic number, because the mean of its divisors is an integer number (255635214).

Almost surely, 2^681693902 is an apocalyptic number.

681693902 is a deficient number, since it is larger than the sum of its proper divisors (340846954).

681693902 is a wasteful number, since it uses less digits than its factorization.

681693902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340846953.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 681693902 is about 26109.2685075626. The cubic root of 681693902 is about 880.0955053026.

The spelling of 681693902 in words is "six hundred eighty-one million, six hundred ninety-three thousand, nine hundred two".