642999042 has 48 divisors (see below), whose sum is σ = 1593738432. Its totient is φ = 183535200.

The previous prime is 642999013. The next prime is 642999157. The reversal of 642999042 is 240999246.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 181068 + ... + 184584.

It is an arithmetic number, because the mean of its divisors is an integer number (33202884).

Almost surely, 2^642999042 is an apocalyptic number.

642999042 is an abundant number, since it is smaller than the sum of its proper divisors (950739390).

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

642999042 is a wasteful number, since it uses less digits than its factorization.

642999042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4983 (or 4980 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 642999042 is about 25357.4257762889. The cubic root of 642999042 is about 863.1178705649.

The spelling of 642999042 in words is "six hundred forty-two million, nine hundred ninety-nine thousand, forty-two".