642881233 has 4 divisors (see below), whose sum is σ = 643648320. Its totient is φ = 642114148.

The previous prime is 642881221. The next prime is 642881243. The reversal of 642881233 is 332188246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 642881233 - 2⁵ = 642881201 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642881192 and 642881201.

It is not an unprimeable number, because it can be changed into a prime (642881243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 382285 + ... + 383962.

It is an arithmetic number, because the mean of its divisors is an integer number (160912080).

Almost surely, 2^642881233 is an apocalyptic number.

It is an amenable number.

642881233 is a deficient number, since it is larger than the sum of its proper divisors (767087).

642881233 is an equidigital number, since it uses as much as digits as its factorization.

642881233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767086.

The product of its digits is 55296, while the sum is 37.

The square root of 642881233 is about 25355.1027014288. The cubic root of 642881233 is about 863.0651544345.

The spelling of 642881233 in words is "six hundred forty-two million, eight hundred eighty-one thousand, two hundred thirty-three".