64445724 has 72 divisors (see below), whose sum is σ = 194288640. Its totient is φ = 17610912.

The previous prime is 64445713. The next prime is 64445737. The reversal of 64445724 is 42754446.

64445724 is a `hidden beast` number, since 644 + 4 + 5 + 7 + 2 + 4 = 666.

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

It is a congruent number.

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, 237 + ... + 11355.

Almost surely, 2^64445724 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 64445724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97144320).

64445724 is an abundant number, since it is smaller than the sum of its proper divisors (129842916).

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

64445724 is a wasteful number, since it uses less digits than its factorization.

64445724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11159 (or 11154 counting only the distinct ones).

The product of its digits is 107520, while the sum is 36.

The square root of 64445724 is about 8027.8094147781. The cubic root of 64445724 is about 400.9264442626.

The spelling of 64445724 in words is "sixty-four million, four hundred forty-five thousand, seven hundred twenty-four".