64390680 has 64 divisors (see below), whose sum is σ = 214639200. Its totient is φ = 17170560.

The previous prime is 64390661. The next prime is 64390709. The reversal of 64390680 is 8609346.

64390680 is a `hidden beast` number, since 643 + 9 + 0 + 6 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28731 + ... + 30890.

Almost surely, 2^64390680 is an apocalyptic number.

64390680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64390680 is an abundant number, since it is smaller than the sum of its proper divisors (150248520).

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

64390680 is a wasteful number, since it uses less digits than its factorization.

64390680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59641 (or 59631 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 64390680 is about 8024.3803499086. The cubic root of 64390680 is about 400.8122661096.

The spelling of 64390680 in words is "sixty-four million, three hundred ninety thousand, six hundred eighty".