642868750 has 24 divisors (see below), whose sum is σ = 1205313480. Its totient is φ = 257145000.

The previous prime is 642868739. The next prime is 642868769. The reversal of 642868750 is 57868246.

It is a self number, because there is not a number n which added to its sum of digits gives 642868750.

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 11 ways as a sum of consecutive naturals, for example, 45180 + ... + 57679.

It is an arithmetic number, because the mean of its divisors is an integer number (50221395).

Almost surely, 2^642868750 is an apocalyptic number.

642868750 is a deficient number, since it is larger than the sum of its proper divisors (562444730).

642868750 is an equidigital number, since it uses as much as digits as its factorization.

642868750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102886 (or 102866 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 46.

The square root of 642868750 is about 25354.8565367663. The cubic root of 642868750 is about 863.0595682747.

The spelling of 642868750 in words is "six hundred forty-two million, eight hundred sixty-eight thousand, seven hundred fifty".