642868027 has 4 divisors (see below), whose sum is σ = 665035920. Its totient is φ = 620700136.

The previous prime is 642867989. The next prime is 642868067. The reversal of 642868027 is 720868246.

642868027 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 642868027 - 2²⁷ = 508650299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642868067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11083903 + ... + 11083960.

It is an arithmetic number, because the mean of its divisors is an integer number (166258980).

Almost surely, 2^642868027 is an apocalyptic number.

642868027 is a deficient number, since it is larger than the sum of its proper divisors (22167893).

642868027 is a wasteful number, since it uses less digits than its factorization.

642868027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22167892.

The product of its (nonzero) digits is 258048, while the sum is 43.

The square root of 642868027 is about 25354.8422791387. The cubic root of 642868027 is about 863.0592447289.

The spelling of 642868027 in words is "six hundred forty-two million, eight hundred sixty-eight thousand, twenty-seven".