64381864 has 16 divisors (see below), whose sum is σ = 121010400. Its totient is φ = 32112432.

The previous prime is 64381829. The next prime is 64381871. The reversal of 64381864 is 46818346.

It is a super-2 number, since 2×64381864² = 8290048824228992, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6252 + ... + 12955.

It is an arithmetic number, because the mean of its divisors is an integer number (7563150).

Almost surely, 2^64381864 is an apocalyptic number.

It is an amenable number.

64381864 is a deficient number, since it is larger than the sum of its proper divisors (56628536).

64381864 is a wasteful number, since it uses less digits than its factorization.

64381864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19632 (or 19628 counting only the distinct ones).

The product of its digits is 110592, while the sum is 40.

The square root of 64381864 is about 8023.8310051994. The cubic root of 64381864 is about 400.7939729745.

The spelling of 64381864 in words is "sixty-four million, three hundred eighty-one thousand, eight hundred sixty-four".