642090432 has 56 divisors (see below), whose sum is σ = 1705138576. Its totient is φ = 213239808.

The previous prime is 642090403. The next prime is 642090443. The reversal of 642090432 is 234090246.

It is a self number, because there is not a number n which added to its sum of digits gives 642090432.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47148 + ... + 59220.

Almost surely, 2^642090432 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 642090432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (852569288).

642090432 is an abundant number, since it is smaller than the sum of its proper divisors (1063048144).

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

642090432 is a wasteful number, since it uses less digits than its factorization.

642090432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12365 (or 12355 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 642090432 is about 25339.5033889775. The cubic root of 642090432 is about 862.7111269750.

The spelling of 642090432 in words is "six hundred forty-two million, ninety thousand, four hundred thirty-two".