64724544 has 84 divisors (see below), whose sum is σ = 190598044. Its totient is φ = 20984832.

The previous prime is 64724533. The next prime is 64724573. The reversal of 64724544 is 44542746.

64724544 is a `hidden beast` number, since 647 + 2 + 4 + 5 + 4 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 56430144 + 8294400 = 7512^2 + 2880^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 64724499 and 64724508.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19794 + ... + 22830.

Almost surely, 2^64724544 is an apocalyptic number.

64724544 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64724544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95299022).

64724544 is an abundant number, since it is smaller than the sum of its proper divisors (125873500).

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

64724544 is a wasteful number, since it uses less digits than its factorization.

64724544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3092 (or 3079 counting only the distinct ones).

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

The square root of 64724544 is about 8045.1565553443. The cubic root of 64724544 is about 401.5038060005.

The spelling of 64724544 in words is "sixty-four million, seven hundred twenty-four thousand, five hundred forty-four".