64445256 has 72 divisors (see below), whose sum is σ = 178084530. Its totient is φ = 21052416.

The previous prime is 64445243. The next prime is 64445263. The reversal of 64445256 is 65254446.

64445256 is a `hidden beast` number, since 644 + 4 + 5 + 2 + 5 + 6 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 15920100 + 48525156 = 3990^2 + 6966^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 64445256.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 570256 + ... + 570368.

Almost surely, 2^64445256 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 64445256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89042265).

64445256 is an abundant number, since it is smaller than the sum of its proper divisors (113639274).

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

64445256 is a wasteful number, since it uses less digits than its factorization.

64445256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303 (or 207 counting only the distinct ones).

The product of its digits is 115200, while the sum is 36.

The square root of 64445256 is about 8027.7802660511. The cubic root of 64445256 is about 400.9254737611.

The spelling of 64445256 in words is "sixty-four million, four hundred forty-five thousand, two hundred fifty-six".