642869135 has 32 divisors (see below), whose sum is σ = 814701888. Its totient is φ = 486420480.

The previous prime is 642869119. The next prime is 642869147. The reversal of 642869135 is 531968246.

It is not a de Polignac number, because 642869135 - 2⁴ = 642869119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2053739 + ... + 2054051.

It is an arithmetic number, because the mean of its divisors is an integer number (25459434).

Almost surely, 2^642869135 is an apocalyptic number.

642869135 is a deficient number, since it is larger than the sum of its proper divisors (171832753).

642869135 is a wasteful number, since it uses less digits than its factorization.

642869135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635.

The product of its digits is 311040, while the sum is 44.

The square root of 642869135 is about 25354.8641289990. The cubic root of 642869135 is about 863.0597405638.

The spelling of 642869135 in words is "six hundred forty-two million, eight hundred sixty-nine thousand, one hundred thirty-five".