642209262 has 16 divisors (see below), whose sum is σ = 1284739920. Its totient is φ = 214016192.

The previous prime is 642209231. The next prime is 642209273. The reversal of 642209262 is 262902246.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18388 + ... + 40280.

It is an arithmetic number, because the mean of its divisors is an integer number (80296245).

Almost surely, 2^642209262 is an apocalyptic number.

642209262 is an abundant number, since it is smaller than the sum of its proper divisors (642530658).

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

642209262 is a wasteful number, since it uses less digits than its factorization.

642209262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26787.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 642209262 is about 25341.8480383732. The cubic root of 642209262 is about 862.7643435910.

The spelling of 642209262 in words is "six hundred forty-two million, two hundred nine thousand, two hundred sixty-two".