642954244 has 24 divisors (see below), whose sum is σ = 1181355840. Its totient is φ = 305755296.

The previous prime is 642954239. The next prime is 642954283. The reversal of 642954244 is 442459246.

It is a super-2 number, since 2×642954244² = 826780319755223072, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 642954197 and 642954206.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33592 + ... + 49135.

It is an arithmetic number, because the mean of its divisors is an integer number (49223160).

Almost surely, 2^642954244 is an apocalyptic number.

It is an amenable number.

642954244 is a deficient number, since it is larger than the sum of its proper divisors (538401596).

642954244 is a wasteful number, since it uses less digits than its factorization.

642954244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82827 (or 82825 counting only the distinct ones).

The product of its digits is 276480, while the sum is 40.

The square root of 642954244 is about 25356.5424299134. The cubic root of 642954244 is about 863.0978255104.

The spelling of 642954244 in words is "six hundred forty-two million, nine hundred fifty-four thousand, two hundred forty-four".