681290402 has 16 divisors (see below), whose sum is σ = 1165284792. Its totient is φ = 295944960.

The previous prime is 681290347. The next prime is 681290411. The reversal of 681290402 is 204092186.

It can be written as a sum of positive squares in 4 ways, for example, as 512524321 + 168766081 = 22639^2 + 12991^2 .

It is a super-2 number, since 2×681290402² = 928313223714643208, which contains 22 as substring.

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, 770249 + ... + 771132.

Almost surely, 2^681290402 is an apocalyptic number.

681290402 is a deficient number, since it is larger than the sum of its proper divisors (483994390).

681290402 is a wasteful number, since it uses less digits than its factorization.

681290402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1541413.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 681290402 is about 26101.5402227531. The cubic root of 681290402 is about 879.9218258725.

The spelling of 681290402 in words is "six hundred eighty-one million, two hundred ninety thousand, four hundred two".