681502064 has 10 divisors (see below), whose sum is σ = 1320410280. Its totient is φ = 340751024.

The previous prime is 681502061. The next prime is 681502139. The reversal of 681502064 is 460205186.

681502064 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 681502064.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681502061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21296924 + ... + 21296955.

It is an arithmetic number, because the mean of its divisors is an integer number (132041028).

Almost surely, 2^681502064 is an apocalyptic number.

It is an amenable number.

681502064 is a deficient number, since it is larger than the sum of its proper divisors (638908216).

681502064 is a wasteful number, since it uses less digits than its factorization.

681502064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42593887 (or 42593881 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 681502064 is about 26105.5944961995. The cubic root of 681502064 is about 880.0129405811.

The spelling of 681502064 in words is "six hundred eighty-one million, five hundred two thousand, sixty-four".