642634433 has 16 divisors (see below), whose sum is σ = 761364480. Its totient is φ = 530787600.

The previous prime is 642634423. The next prime is 642634439. The reversal of 642634433 is 334436246.

It is not a de Polignac number, because 642634433 - 2⁸ = 642634177 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642634393 and 642634402.

It is not an unprimeable number, because it can be changed into a prime (642634439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45668 + ... + 58058.

It is an arithmetic number, because the mean of its divisors is an integer number (47585280).

Almost surely, 2^642634433 is an apocalyptic number.

It is an amenable number.

642634433 is a deficient number, since it is larger than the sum of its proper divisors (118730047).

642634433 is a wasteful number, since it uses less digits than its factorization.

642634433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12668.

The product of its digits is 124416, while the sum is 35.

The square root of 642634433 is about 25350.2353637989. The cubic root of 642634433 is about 862.9546976699.

The spelling of 642634433 in words is "six hundred forty-two million, six hundred thirty-four thousand, four hundred thirty-three".