64789521 has 16 divisors (see below), whose sum is σ = 87532800. Its totient is φ = 42624000.

The previous prime is 64789507. The next prime is 64789523. The reversal of 64789521 is 12598746.

64789521 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 64789521 - 2⁵ = 64789489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64789523) 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 15 ways as a sum of consecutive naturals, for example, 85896 + ... + 86646.

It is an arithmetic number, because the mean of its divisors is an integer number (5470800).

Almost surely, 2^64789521 is an apocalyptic number.

It is an amenable number.

64789521 is a deficient number, since it is larger than the sum of its proper divisors (22743279).

64789521 is a wasteful number, since it uses less digits than its factorization.

64789521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096.

The product of its digits is 120960, while the sum is 42.

The square root of 64789521 is about 8049.1938105626. The cubic root of 64789521 is about 401.6381176849.

The spelling of 64789521 in words is "sixty-four million, seven hundred eighty-nine thousand, five hundred twenty-one".