64009520 has 20 divisors (see below), whose sum is σ = 148822320. Its totient is φ = 25603776.

The previous prime is 64009511. The next prime is 64009523. The reversal of 64009520 is 2590046.

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 (26) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 64009520.

It is not an unprimeable number, because it can be changed into a prime (64009523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399980 + ... + 400139.

It is an arithmetic number, because the mean of its divisors is an integer number (7441116).

Almost surely, 2^64009520 is an apocalyptic number.

It is an amenable number.

64009520 is an abundant number, since it is smaller than the sum of its proper divisors (84812800).

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

64009520 is a wasteful number, since it uses less digits than its factorization.

64009520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800132 (or 800126 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 64009520 is about 8000.5949778751. The cubic root of 64009520 is about 400.0198323500.

Adding to 64009520 its reverse (2590046), we get a palindrome (66599566).

The spelling of 64009520 in words is "sixty-four million, nine thousand, five hundred twenty".