642905298 has 48 divisors (see below), whose sum is σ = 1628991936. Its totient is φ = 179413920.

The previous prime is 642905287. The next prime is 642905309. The reversal of 642905298 is 892509246.

642905298 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (642905287) and next prime (642905309).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53913 + ... + 64748.

It is an arithmetic number, because the mean of its divisors is an integer number (33937332).

Almost surely, 2^642905298 is an apocalyptic number.

642905298 is an abundant number, since it is smaller than the sum of its proper divisors (986086638).

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

642905298 is a wasteful number, since it uses less digits than its factorization.

642905298 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118719 (or 118716 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 642905298 is about 25355.5772562961. The cubic root of 642905298 is about 863.0759233515.

The spelling of 642905298 in words is "six hundred forty-two million, nine hundred five thousand, two hundred ninety-eight".