64215144 has 96 divisors (see below), whose sum is σ = 200853120. Its totient is φ = 18154368.

The previous prime is 64215139. The next prime is 64215157. The reversal of 64215144 is 44151246.

64215144 is a `hidden beast` number, since 642 + 1 + 5 + 14 + 4 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51294 + ... + 52530.

It is an arithmetic number, because the mean of its divisors is an integer number (2092220).

Almost surely, 2^64215144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64215144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100426560).

64215144 is an abundant number, since it is smaller than the sum of its proper divisors (136637976).

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

64215144 is a wasteful number, since it uses less digits than its factorization.

64215144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1359 (or 1352 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 64215144 is about 8013.4352184316. The cubic root of 64215144 is about 400.4477153571.

The spelling of 64215144 in words is "sixty-four million, two hundred fifteen thousand, one hundred forty-four".