642797135 has 8 divisors (see below), whose sum is σ = 772261776. Its totient is φ = 513634240.

The previous prime is 642797117. The next prime is 642797137. The reversal of 642797135 is 531797246.

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

It is not a de Polignac number, because 642797135 - 2¹⁶ = 642731599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642797137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70721 + ... + 79290.

It is an arithmetic number, because the mean of its divisors is an integer number (96532722).

Almost surely, 2^642797135 is an apocalyptic number.

642797135 is a deficient number, since it is larger than the sum of its proper divisors (129464641).

642797135 is a wasteful number, since it uses less digits than its factorization.

642797135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150873.

The product of its digits is 317520, while the sum is 44.

The square root of 642797135 is about 25353.4442433370. Note that the first 3 decimals coincide. The cubic root of 642797135 is about 863.0275190649.

The spelling of 642797135 in words is "six hundred forty-two million, seven hundred ninety-seven thousand, one hundred thirty-five".