681636576 has 24 divisors (see below), whose sum is σ = 1789296264. Its totient is φ = 227212160.

The previous prime is 681636563. The next prime is 681636581. The reversal of 681636576 is 675636186.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

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, 3550095 + ... + 3550286.

It is an arithmetic number, because the mean of its divisors is an integer number (74554011).

Almost surely, 2^681636576 is an apocalyptic number.

It is an amenable number.

681636576 is an abundant number, since it is smaller than the sum of its proper divisors (1107659688).

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

681636576 is a wasteful number, since it uses less digits than its factorization.

681636576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7100394 (or 7100386 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 48.

The square root of 681636576 is about 26108.1706750971. The cubic root of 681636576 is about 880.0708345185.

The spelling of 681636576 in words is "six hundred eighty-one million, six hundred thirty-six thousand, five hundred seventy-six".