642610266 has 32 divisors (see below), whose sum is σ = 1329058368. Its totient is φ = 207018240.

The previous prime is 642610231. The next prime is 642610277. The reversal of 642610266 is 662016246.

642610266 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6226 + ... + 36386.

It is an arithmetic number, because the mean of its divisors is an integer number (41533074).

Almost surely, 2^642610266 is an apocalyptic number.

642610266 is an abundant number, since it is smaller than the sum of its proper divisors (686448102).

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

642610266 is a wasteful number, since it uses less digits than its factorization.

642610266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30286.

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

The square root of 642610266 is about 25349.7586970764. The cubic root of 642610266 is about 862.9438800694.

The spelling of 642610266 in words is "six hundred forty-two million, six hundred ten thousand, two hundred sixty-six".