64421875 has 56 divisors (see below), whose sum is σ = 99998720. Its totient is φ = 40500000.

The previous prime is 64421809. The next prime is 64421879. The reversal of 64421875 is 57812446.

It is not a de Polignac number, because 64421875 - 2¹¹ = 64419827 is a prime.

It is a taxicab number since it can be written as a sum of two cubes in more than one way. Here 64421875 = 75³ + 400³ = 270³ + 355³.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64421879) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 2078110 + ... + 2078140.

Almost surely, 2^64421875 is an apocalyptic number.

64421875 is a deficient number, since it is larger than the sum of its proper divisors (35576845).

64421875 is an frugal number, since it uses more digits than its factorization.

64421875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87 (or 62 counting only the distinct ones).

The product of its digits is 53760, while the sum is 37.

The square root of 64421875 is about 8026.3238783393. The cubic root of 64421875 is about 400.8769821008.

It can be divided in two parts, 64 and 421875, that multiplied together give a cube (27000000 = 300³).

The spelling of 64421875 in words is "sixty-four million, four hundred twenty-one thousand, eight hundred seventy-five".