642816468 has 36 divisors (see below), whose sum is σ = 1857026080. Its totient is φ = 183661776.

The previous prime is 642816439. The next prime is 642816497. The reversal of 642816468 is 864618246.

642816468 is a `hidden beast` number, since 6 + 428 + 164 + 68 = 666.

It is an interprime number because it is at equal distance from previous prime (642816439) and next prime (642816497).

It is a tau number, because it is divible by the number of its divisors (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 11 ways as a sum of consecutive naturals, for example, 1275178 + ... + 1275681.

Almost surely, 2^642816468 is an apocalyptic number.

It is an amenable number.

642816468 is an abundant number, since it is smaller than the sum of its proper divisors (1214209612).

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

642816468 is a wasteful number, since it uses less digits than its factorization.

642816468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2550876 (or 2550871 counting only the distinct ones).

The product of its digits is 442368, while the sum is 45.

The square root of 642816468 is about 25353.8255101671. The cubic root of 642816468 is about 863.0361712212.

The spelling of 642816468 in words is "six hundred forty-two million, eight hundred sixteen thousand, four hundred sixty-eight".