64805728 has 24 divisors (see below), whose sum is σ = 137401488. Its totient is φ = 29910144.

The previous prime is 64805723. The next prime is 64805737. The reversal of 64805728 is 82750846.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64805723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77476 + ... + 78307.

It is an arithmetic number, because the mean of its divisors is an integer number (5725062).

Almost surely, 2^64805728 is an apocalyptic number.

It is an amenable number.

64805728 is an abundant number, since it is smaller than the sum of its proper divisors (72595760).

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

64805728 is a wasteful number, since it uses less digits than its factorization.

64805728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155806 (or 155798 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 64805728 is about 8050.2004943976. The cubic root of 64805728 is about 401.6716046140.

The spelling of 64805728 in words is "sixty-four million, eight hundred five thousand, seven hundred twenty-eight".