681542816 has 24 divisors (see below), whose sum is σ = 1346121504. Its totient is φ = 339670720.

The previous prime is 681542803. The next prime is 681542821. The reversal of 681542816 is 618245186.

It is a super-2 number, since 2×681542816² = 929001220082419712, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24290 + ... + 44193.

It is an arithmetic number, because the mean of its divisors is an integer number (56088396).

Almost surely, 2^681542816 is an apocalyptic number.

It is an amenable number.

681542816 is a deficient number, since it is larger than the sum of its proper divisors (664578688).

681542816 is a wasteful number, since it uses less digits than its factorization.

681542816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68804 (or 68796 counting only the distinct ones).

The product of its digits is 92160, while the sum is 41.

The square root of 681542816 is about 26106.3750068829. The cubic root of 681542816 is about 880.0304810379.

The spelling of 681542816 in words is "six hundred eighty-one million, five hundred forty-two thousand, eight hundred sixteen".