642888801 has 24 divisors (see below), whose sum is σ = 995192640. Its totient is φ = 398873376.

The previous prime is 642888797. The next prime is 642888823. The reversal of 642888801 is 108888246.

It is a happy number.

It is not a de Polignac number, because 642888801 - 2² = 642888797 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642888101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34311 + ... + 49628.

It is an arithmetic number, because the mean of its divisors is an integer number (41466360).

Almost surely, 2^642888801 is an apocalyptic number.

It is an amenable number.

642888801 is a deficient number, since it is larger than the sum of its proper divisors (352303839).

642888801 is a wasteful number, since it uses less digits than its factorization.

642888801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84005 (or 84002 counting only the distinct ones).

The product of its (nonzero) digits is 196608, while the sum is 45.

The square root of 642888801 is about 25355.2519411660. The cubic root of 642888801 is about 863.0685410899.

The spelling of 642888801 in words is "six hundred forty-two million, eight hundred eighty-eight thousand, eight hundred one".