642216490 has 16 divisors (see below), whose sum is σ = 1162045440. Its totient is φ = 255540880.

The previous prime is 642216451. The next prime is 642216527. The reversal of 642216490 is 94612246.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166210 + ... + 170029.

It is an arithmetic number, because the mean of its divisors is an integer number (72627840).

Almost surely, 2^642216490 is an apocalyptic number.

642216490 is a deficient number, since it is larger than the sum of its proper divisors (519828950).

642216490 is a wasteful number, since it uses less digits than its factorization.

642216490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336437.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 642216490 is about 25341.9906479345. The cubic root of 642216490 is about 862.7675803538.

The spelling of 642216490 in words is "six hundred forty-two million, two hundred sixteen thousand, four hundred ninety".