642995235 has 24 divisors (see below), whose sum is σ = 1122554160. Its totient is φ = 340460352.

The previous prime is 642995231. The next prime is 642995261. The reversal of 642995235 is 532599246.

It is not a de Polignac number, because 642995235 - 2² = 642995231 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (642995231) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 45144 + ... + 57653.

It is an arithmetic number, because the mean of its divisors is an integer number (46773090).

Almost surely, 2^642995235 is an apocalyptic number.

642995235 is a deficient number, since it is larger than the sum of its proper divisors (479558925).

642995235 is a wasteful number, since it uses less digits than its factorization.

642995235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102947 (or 102944 counting only the distinct ones).

The product of its digits is 583200, while the sum is 45.

The square root of 642995235 is about 25357.3507094097. The cubic root of 642995235 is about 863.1161671428.

The spelling of 642995235 in words is "six hundred forty-two million, nine hundred ninety-five thousand, two hundred thirty-five".