64520855 has 24 divisors (see below), whose sum is σ = 90682272. Its totient is φ = 43170624.

The previous prime is 64520803. The next prime is 64520857. The reversal of 64520855 is 55802546.

64520855 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64520855 - 2⁶ = 64520791 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64520857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64217 + ... + 65213.

It is an arithmetic number, because the mean of its divisors is an integer number (3778428).

Almost surely, 2^64520855 is an apocalyptic number.

64520855 is a deficient number, since it is larger than the sum of its proper divisors (26161417).

64520855 is an equidigital number, since it uses as much as digits as its factorization.

64520855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095 (or 1052 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 35.

The square root of 64520855 is about 8032.4874727571. The cubic root of 64520855 is about 401.0821841367.

The spelling of 64520855 in words is "sixty-four million, five hundred twenty thousand, eight hundred fifty-five".