642082890 has 16 divisors (see below), whose sum is σ = 1540999008. Its totient is φ = 171222096.

The previous prime is 642082873. The next prime is 642082897. The reversal of 642082890 is 98280246.

It is not an unprimeable number, because it can be changed into a prime (642082897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10701352 + ... + 10701411.

It is an arithmetic number, because the mean of its divisors is an integer number (96312438).

Almost surely, 2^642082890 is an apocalyptic number.

642082890 is an abundant number, since it is smaller than the sum of its proper divisors (898916118).

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

642082890 is a wasteful number, since it uses less digits than its factorization.

642082890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21402773.

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 642082890 is about 25339.3545695229. The cubic root of 642082890 is about 862.7077491576.

The spelling of 642082890 in words is "six hundred forty-two million, eighty-two thousand, eight hundred ninety".