64757680 has 80 divisors (see below), whose sum is σ = 164614464. Its totient is φ = 23546880.

The previous prime is 64757677. The next prime is 64757687. The reversal of 64757680 is 8675746.

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

It is not an unprimeable number, because it can be changed into a prime (64757687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73402 + ... + 74278.

Almost surely, 2^64757680 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64757680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82307232).

64757680 is an abundant number, since it is smaller than the sum of its proper divisors (99856784).

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

64757680 is a wasteful number, since it uses less digits than its factorization.

64757680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974 (or 968 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 43.

The square root of 64757680 is about 8047.2156675461. The cubic root of 64757680 is about 401.5723114935.

The spelling of 64757680 in words is "sixty-four million, seven hundred fifty-seven thousand, six hundred eighty".