642381992 has 32 divisors (see below), whose sum is σ = 1457507520. Its totient is φ = 259111680.

The previous prime is 642381991. The next prime is 642382021. The reversal of 642381992 is 299183246.

It is not an unprimeable number, because it can be changed into a prime (642381991) 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, 336434 + ... + 338337.

It is an arithmetic number, because the mean of its divisors is an integer number (45547110).

Almost surely, 2^642381992 is an apocalyptic number.

It is an amenable number.

642381992 is an abundant number, since it is smaller than the sum of its proper divisors (815125528).

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

642381992 is a wasteful number, since it uses less digits than its factorization.

642381992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674801 (or 674797 counting only the distinct ones).

The product of its digits is 186624, while the sum is 44.

The square root of 642381992 is about 25345.2558085335. The cubic root of 642381992 is about 862.8416869821.

The spelling of 642381992 in words is "six hundred forty-two million, three hundred eighty-one thousand, nine hundred ninety-two".