642632158 has 12 divisors (see below), whose sum is σ = 1121327712. Its totient is φ = 275413740.

The previous prime is 642632153. The next prime is 642632161. The reversal of 642632158 is 851236246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642632153) 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 5 ways as a sum of consecutive naturals, for example, 3278638 + ... + 3278833.

It is an arithmetic number, because the mean of its divisors is an integer number (93443976).

Almost surely, 2^642632158 is an apocalyptic number.

642632158 is a deficient number, since it is larger than the sum of its proper divisors (478695554).

642632158 is a wasteful number, since it uses less digits than its factorization.

642632158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6557487 (or 6557480 counting only the distinct ones).

The product of its digits is 69120, while the sum is 37.

The square root of 642632158 is about 25350.1904923809. The cubic root of 642632158 is about 862.9536793490.

The spelling of 642632158 in words is "six hundred forty-two million, six hundred thirty-two thousand, one hundred fifty-eight".