64533870 has 48 divisors (see below), whose sum is σ = 177662160. Its totient is φ = 16196352.

The previous prime is 64533869. The next prime is 64533923. The reversal of 64533870 is 7833546.

It is a happy number.

64533870 is a `hidden beast` number, since 645 + 3 + 3 + 8 + 7 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19560 + ... + 22619.

It is an arithmetic number, because the mean of its divisors is an integer number (3701295).

Almost surely, 2^64533870 is an apocalyptic number.

64533870 is an abundant number, since it is smaller than the sum of its proper divisors (113128290).

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

64533870 is a wasteful number, since it uses less digits than its factorization.

64533870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42209 (or 42206 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 64533870 is about 8033.2975794502. The cubic root of 64533870 is about 401.1091507853.

The spelling of 64533870 in words is "sixty-four million, five hundred thirty-three thousand, eight hundred seventy".