642888845 has 8 divisors (see below), whose sum is σ = 812070240. Its totient is φ = 487242000.

The previous prime is 642888823. The next prime is 642888853. The reversal of 642888845 is 548888246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 642888845 - 2²² = 638694541 is a prime.

It is a congruent number.

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, 3383531 + ... + 3383720.

It is an arithmetic number, because the mean of its divisors is an integer number (101508780).

Almost surely, 2^642888845 is an apocalyptic number.

It is an amenable number.

642888845 is a deficient number, since it is larger than the sum of its proper divisors (169181395).

642888845 is a wasteful number, since it uses less digits than its factorization.

642888845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6767275.

The product of its digits is 3932160, while the sum is 53.

The square root of 642888845 is about 25355.2528088363. The cubic root of 642888845 is about 863.0685607796.

The spelling of 642888845 in words is "six hundred forty-two million, eight hundred eighty-eight thousand, eight hundred forty-five".