64215172 has 24 divisors (see below), whose sum is σ = 134015616. Its totient is φ = 26323968.

The previous prime is 64215163. The next prime is 64215181. The reversal of 64215172 is 27151246.

64215172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (64215163) and next prime (64215181).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 64215172.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 49213 + ... + 50500.

It is an arithmetic number, because the mean of its divisors is an integer number (5583984).

Almost surely, 2^64215172 is an apocalyptic number.

It is an amenable number.

64215172 is an abundant number, since it is smaller than the sum of its proper divisors (69800444).

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

64215172 is a wasteful number, since it uses less digits than its factorization.

64215172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99747 (or 99745 counting only the distinct ones).

The product of its digits is 3360, while the sum is 28.

The square root of 64215172 is about 8013.4369654974. The cubic root of 64215172 is about 400.4477735601.

The spelling of 64215172 in words is "sixty-four million, two hundred fifteen thousand, one hundred seventy-two".