64324728 has 96 divisors (see below), whose sum is σ = 197542800. Its totient is φ = 18745344.

The previous prime is 64324693. The next prime is 64324769. The reversal of 64324728 is 82742346.

64324728 is a `hidden beast` number, since 643 + 2 + 4 + 7 + 2 + 8 = 666.

64324728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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 = 64324692 and 64324701.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 15976 + ... + 19592.

Almost surely, 2^64324728 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 64324728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98771400).

64324728 is an abundant number, since it is smaller than the sum of its proper divisors (133218072).

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

64324728 is a wasteful number, since it uses less digits than its factorization.

64324728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3661 (or 3654 counting only the distinct ones).

The product of its digits is 64512, while the sum is 36.

The square root of 64324728 is about 8020.2698208975. The cubic root of 64324728 is about 400.6753756941.

The spelling of 64324728 in words is "sixty-four million, three hundred twenty-four thousand, seven hundred twenty-eight".