642090936 has 32 divisors (see below), whose sum is σ = 1621126800. Its totient is φ = 211910400.

The previous prime is 642090913. The next prime is 642090983. The reversal of 642090936 is 639090246.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 642090894 and 642090903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130021 + ... + 134868.

Almost surely, 2^642090936 is an apocalyptic number.

It is an amenable number.

642090936 is an abundant number, since it is smaller than the sum of its proper divisors (979035864).

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

642090936 is a wasteful number, since it uses less digits than its factorization.

642090936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264999 (or 264995 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 39.

The square root of 642090936 is about 25339.5133339218. The cubic root of 642090936 is about 862.7113526994.

The spelling of 642090936 in words is "six hundred forty-two million, ninety thousand, nine hundred thirty-six".