642881232 has 80 divisors (see below), whose sum is σ = 2108932480. Its totient is φ = 183679488.

The previous prime is 642881221. The next prime is 642881243. The reversal of 642881232 is 232188246.

642881232 is a `hidden beast` number, since 642 + 8 + 8 + 1 + 2 + 3 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (642881221) and next prime (642881243).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 103273 + ... + 109320.

It is an arithmetic number, because the mean of its divisors is an integer number (26361656).

Almost surely, 2^642881232 is an apocalyptic number.

It is an amenable number.

642881232 is an abundant number, since it is smaller than the sum of its proper divisors (1466051248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642881232 is a wasteful number, since it uses less digits than its factorization.

642881232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212617 (or 212605 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 642881232 is about 25355.1026817089. The cubic root of 642881232 is about 863.0651539870.

The spelling of 642881232 in words is "six hundred forty-two million, eight hundred eighty-one thousand, two hundred thirty-two".