64407637680 has 80 divisors (see below), whose sum is σ = 200097130464. Its totient is φ = 17138083840.

The previous prime is 64407637649. The next prime is 64407637703. The reversal of 64407637680 is 8673670446.

It is a tau number, because it is divible by the number of its divisors (80).

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, 180429 + ... + 401708.

Almost surely, 2^64407637680 is an apocalyptic number.

64407637680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64407637680 is an abundant number, since it is smaller than the sum of its proper divisors (135689492784).

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

64407637680 is a wasteful number, since it uses less digits than its factorization.

64407637680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582614 (or 582608 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 51.

The spelling of 64407637680 in words is "sixty-four billion, four hundred seven million, six hundred thirty-seven thousand, six hundred eighty".