642313874 has 4 divisors (see below), whose sum is σ = 963470814. Its totient is φ = 321156936.

The previous prime is 642313849. The next prime is 642313877. The reversal of 642313874 is 478313246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 478313246 = 2 ⋅239156623.

It can be written as a sum of positive squares in only one way, i.e., 642267649 + 46225 = 25343^2 + 215^2 .

It is a super-2 number, since 2×642313874² = 825134225465775752, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (642313877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160578467 + ... + 160578470.

Almost surely, 2^642313874 is an apocalyptic number.

642313874 is a deficient number, since it is larger than the sum of its proper divisors (321156940).

642313874 is a wasteful number, since it uses less digits than its factorization.

642313874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321156939.

The product of its digits is 96768, while the sum is 38.

The square root of 642313874 is about 25343.9119711224. The cubic root of 642313874 is about 862.8111874100.

The spelling of 642313874 in words is "six hundred forty-two million, three hundred thirteen thousand, eight hundred seventy-four".