681923772 has 30 divisors (see below), whose sum is σ = 1782684288. Its totient is φ = 227307816.

The previous prime is 681923761. The next prime is 681923783. The reversal of 681923772 is 277329186.

It is an interprime number because it is at equal distance from previous prime (681923761) and next prime (681923783).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1052028 + ... + 1052675.

Almost surely, 2^681923772 is an apocalyptic number.

It is an amenable number.

681923772 is an abundant number, since it is smaller than the sum of its proper divisors (1100760516).

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

681923772 is a wasteful number, since it uses less digits than its factorization.

681923772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2104719 (or 2104708 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 681923772 is about 26113.6702131278. The cubic root of 681923772 is about 880.1944181323.

The spelling of 681923772 in words is "six hundred eighty-one million, nine hundred twenty-three thousand, seven hundred seventy-two".