681900970 has 16 divisors (see below), whose sum is σ = 1227727368. Its totient is φ = 272692480.

The previous prime is 681900953. The next prime is 681900977. The reversal of 681900970 is 79009186.

It can be written as a sum of positive squares in 4 ways, for example, as 681366609 + 534361 = 26103^2 + 731^2 .

It is not an unprimeable number, because it can be changed into a prime (681900977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59982 + ... + 70438.

Almost surely, 2^681900970 is an apocalyptic number.

681900970 is a deficient number, since it is larger than the sum of its proper divisors (545826398).

681900970 is a wasteful number, since it uses less digits than its factorization.

681900970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16985.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 681900970 is about 26113.2336182251. The cubic root of 681900970 is about 880.1846074478.

The spelling of 681900970 in words is "six hundred eighty-one million, nine hundred thousand, nine hundred seventy".