64945520 has 20 divisors (see below), whose sum is σ = 150998520. Its totient is φ = 25978176.

The previous prime is 64945499. The next prime is 64945549. The reversal of 64945520 is 2554946.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 405830 + ... + 405989.

It is an arithmetic number, because the mean of its divisors is an integer number (7549926).

Almost surely, 2^64945520 is an apocalyptic number.

It is an amenable number.

64945520 is an abundant number, since it is smaller than the sum of its proper divisors (86053000).

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

64945520 is a wasteful number, since it uses less digits than its factorization.

64945520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811832 (or 811826 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 64945520 is about 8058.8783338626. The cubic root of 64945520 is about 401.9602115682.

The spelling of 64945520 in words is "sixty-four million, nine hundred forty-five thousand, five hundred twenty".