642249952 has 24 divisors (see below), whose sum is σ = 1276253496. Its totient is φ = 318122112.

The previous prime is 642249941. The next prime is 642249991. The reversal of 642249952 is 259942246.

642249952 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 642249899 and 642249908.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90363 + ... + 97210.

It is an arithmetic number, because the mean of its divisors is an integer number (53177229).

Almost surely, 2^642249952 is an apocalyptic number.

It is an amenable number.

642249952 is a deficient number, since it is larger than the sum of its proper divisors (634003544).

642249952 is a wasteful number, since it uses less digits than its factorization.

642249952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187690 (or 187682 counting only the distinct ones).

The product of its digits is 311040, while the sum is 43.

The square root of 642249952 is about 25342.6508479283. The cubic root of 642249952 is about 862.7825646194.

The spelling of 642249952 in words is "six hundred forty-two million, two hundred forty-nine thousand, nine hundred fifty-two".