64433728 has 28 divisors (see below), whose sum is σ = 128798320. Its totient is φ = 31980672.

The previous prime is 64433713. The next prime is 64433749. The reversal of 64433728 is 82733446.

It is a happy number.

64433728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 3 ways as a sum of consecutive naturals, for example, 5275 + ... + 12517.

It is an arithmetic number, because the mean of its divisors is an integer number (4599940).

Almost surely, 2^64433728 is an apocalyptic number.

It is an amenable number.

64433728 is a deficient number, since it is larger than the sum of its proper divisors (64364592).

64433728 is a wasteful number, since it uses less digits than its factorization.

64433728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7394 (or 7384 counting only the distinct ones).

The product of its digits is 96768, while the sum is 37.

The square root of 64433728 is about 8027.0622272410. The cubic root of 64433728 is about 400.9015664183.

The spelling of 64433728 in words is "sixty-four million, four hundred thirty-three thousand, seven hundred twenty-eight".