642938492 has 96 divisors (see below), whose sum is σ = 1409587200. Its totient is φ = 250449408.

The previous prime is 642938467. The next prime is 642938503. The reversal of 642938492 is 294839246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1751693 + ... + 1752059.

It is an arithmetic number, because the mean of its divisors is an integer number (14683200).

Almost surely, 2^642938492 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642938492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (704793600).

642938492 is an abundant number, since it is smaller than the sum of its proper divisors (766648708).

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

642938492 is a wasteful number, since it uses less digits than its factorization.

642938492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523 (or 521 counting only the distinct ones).

The product of its digits is 746496, while the sum is 47.

The square root of 642938492 is about 25356.2318178392. The cubic root of 642938492 is about 863.0907769902.

The spelling of 642938492 in words is "six hundred forty-two million, nine hundred thirty-eight thousand, four hundred ninety-two".