64397960 has 32 divisors (see below), whose sum is σ = 158068800. Its totient is φ = 23417280.

The previous prime is 64397959. The next prime is 64397981. The reversal of 64397960 is 6979346.

It is a Harshad number since it is a multiple of its sum of digits (44).

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, 72740 + ... + 73619.

It is an arithmetic number, because the mean of its divisors is an integer number (4939650).

Almost surely, 2^64397960 is an apocalyptic number.

It is an amenable number.

64397960 is an abundant number, since it is smaller than the sum of its proper divisors (93670840).

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

64397960 is a wasteful number, since it uses less digits than its factorization.

64397960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146381 (or 146377 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 44.

The square root of 64397960 is about 8024.8339546685. The cubic root of 64397960 is about 400.8273707973.

The spelling of 64397960 in words is "sixty-four million, three hundred ninety-seven thousand, nine hundred sixty".