642364433 has 4 divisors (see below), whose sum is σ = 648049188. Its totient is φ = 636679680.

The previous prime is 642364381. The next prime is 642364439. The reversal of 642364433 is 334463246.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 79156609 + 563207824 = 8897^2 + 23732^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642364433 is a prime.

It is a super-2 number, since 2×642364433² = 825264129566822978, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 642364393 and 642364402.

It is not an unprimeable number, because it can be changed into a prime (642364439) 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, 2842208 + ... + 2842433.

It is an arithmetic number, because the mean of its divisors is an integer number (162012297).

Almost surely, 2^642364433 is an apocalyptic number.

It is an amenable number.

642364433 is a deficient number, since it is larger than the sum of its proper divisors (5684755).

642364433 is a wasteful number, since it uses less digits than its factorization.

642364433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5684754.

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

The square root of 642364433 is about 25344.9094099782. The cubic root of 642364433 is about 862.8338252137.

The spelling of 642364433 in words is "six hundred forty-two million, three hundred sixty-four thousand, four hundred thirty-three".