64897680 has 40 divisors (see below), whose sum is σ = 201183552. Its totient is φ = 17305984.

The previous prime is 64897669. The next prime is 64897691. The reversal of 64897680 is 8679846.

It is an interprime number because it is at equal distance from previous prime (64897669) and next prime (64897691).

It is a tau number, because it is divible by the number of its divisors (40).

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134964 + ... + 135443.

Almost surely, 2^64897680 is an apocalyptic number.

64897680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64897680 is an abundant number, since it is smaller than the sum of its proper divisors (136285872).

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

64897680 is a wasteful number, since it uses less digits than its factorization.

64897680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270423 (or 270417 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 48.

The square root of 64897680 is about 8055.9096320651. The cubic root of 64897680 is about 401.8614903625.

The spelling of 64897680 in words is "sixty-four million, eight hundred ninety-seven thousand, six hundred eighty".