642334290 has 192 divisors, whose sum is σ = 1819601280. Its totient is φ = 144138240.

The previous prime is 642334267. The next prime is 642334309. The reversal of 642334290 is 92433246.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4621041 + ... + 4621179.

It is an arithmetic number, because the mean of its divisors is an integer number (9477090).

Almost surely, 2^642334290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642334290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (909800640).

642334290 is an abundant number, since it is smaller than the sum of its proper divisors (1177266990).

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

642334290 is a wasteful number, since it uses less digits than its factorization.

642334290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 33.

The square root of 642334290 is about 25344.3147470986. The cubic root of 642334290 is about 862.8203288216.

The spelling of 642334290 in words is "six hundred forty-two million, three hundred thirty-four thousand, two hundred ninety".