642972042 has 24 divisors (see below), whose sum is σ = 1394830944. Its totient is φ = 214058664.

The previous prime is 642972017. The next prime is 642972047. The reversal of 642972042 is 240279246.

642972042 is a `hidden beast` number, since 642 + 9 + 7 + 2 + 0 + 4 + 2 = 666.

642972042 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 = 642971988 and 642972006.

It is not an unprimeable number, because it can be changed into a prime (642972047) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6888 + ... + 36515.

It is an arithmetic number, because the mean of its divisors is an integer number (58117956).

Almost surely, 2^642972042 is an apocalyptic number.

642972042 is an abundant number, since it is smaller than the sum of its proper divisors (751858902).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642972042 is a wasteful number, since it uses less digits than its factorization.

642972042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44234 (or 44231 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 642972042 is about 25356.8933822738. The cubic root of 642972042 is about 863.1057894122.

The spelling of 642972042 in words is "six hundred forty-two million, nine hundred seventy-two thousand, forty-two".