642632535 has 80 divisors (see below), whose sum is σ = 1265679360. Its totient is φ = 310495680.

The previous prime is 642632527. The next prime is 642632567. The reversal of 642632535 is 535236246.

642632535 is a `hidden beast` number, since 64 + 2 + 63 + 2 + 535 = 666.

It is not a de Polignac number, because 642632535 - 2³ = 642632527 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 642632535.

It is a congruent number.

It is an unprimeable number.

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 79 ways as a sum of consecutive naturals, for example, 175170 + ... + 178800.

It is an arithmetic number, because the mean of its divisors is an integer number (15820992).

Almost surely, 2^642632535 is an apocalyptic number.

642632535 is a deficient number, since it is larger than the sum of its proper divisors (623046825).

642632535 is a wasteful number, since it uses less digits than its factorization.

642632535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3690 (or 3681 counting only the distinct ones).

The product of its digits is 129600, while the sum is 36.

The square root of 642632535 is about 25350.1979282214. The cubic root of 642632535 is about 862.9538480994.

The spelling of 642632535 in words is "six hundred forty-two million, six hundred thirty-two thousand, five hundred thirty-five".