642728304 has 40 divisors (see below), whose sum is σ = 1844869520. Its totient is φ = 214242624.

The previous prime is 642728291. The next prime is 642728323. The reversal of 642728304 is 403827246.

642728304 is a `hidden beast` number, since 642 + 7 + 2 + 8 + 3 + 0 + 4 = 666.

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

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 7 ways as a sum of consecutive naturals, for example, 743467 + ... + 744330.

It is an arithmetic number, because the mean of its divisors is an integer number (46121738).

Almost surely, 2^642728304 is an apocalyptic number.

It is an amenable number.

642728304 is an abundant number, since it is smaller than the sum of its proper divisors (1202141216).

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

642728304 is a wasteful number, since it uses less digits than its factorization.

642728304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1487814 (or 1487802 counting only the distinct ones).

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

The square root of 642728304 is about 25352.0867780149. The cubic root of 642728304 is about 862.9967135098.

The spelling of 642728304 in words is "six hundred forty-two million, seven hundred twenty-eight thousand, three hundred four".