642602728 has 16 divisors (see below), whose sum is σ = 1214369280. Its totient is φ = 318770928.

The previous prime is 642602693. The next prime is 642602749. The reversal of 642602728 is 827206246.

642602728 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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315226 + ... + 317257.

It is an arithmetic number, because the mean of its divisors is an integer number (75898080).

Almost surely, 2^642602728 is an apocalyptic number.

It is an amenable number.

642602728 is a deficient number, since it is larger than the sum of its proper divisors (571766552).

642602728 is a wasteful number, since it uses less digits than its factorization.

642602728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632616 (or 632612 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 642602728 is about 25349.6100167241. The cubic root of 642602728 is about 862.9405058644.

The spelling of 642602728 in words is "six hundred forty-two million, six hundred two thousand, seven hundred twenty-eight".