642902902 has 8 divisors (see below), whose sum is σ = 964492200. Its totient is φ = 321405504.

The previous prime is 642902891. The next prime is 642902903. The reversal of 642902902 is 209209246.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642902903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1452 + ... + 35887.

It is an arithmetic number, because the mean of its divisors is an integer number (120561525).

Almost surely, 2^642902902 is an apocalyptic number.

642902902 is a deficient number, since it is larger than the sum of its proper divisors (321589298).

642902902 is a wasteful number, since it uses less digits than its factorization.

642902902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45950.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 642902902 is about 25355.5300082645. The cubic root of 642902902 is about 863.0748511705.

The spelling of 642902902 in words is "six hundred forty-two million, nine hundred two thousand, nine hundred two".