642896889 has 8 divisors (see below), whose sum is σ = 864782112. Its totient is φ = 424804800.

The previous prime is 642896861. The next prime is 642896899. The reversal of 642896889 is 988698246.

It is a happy number.

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

It is not a de Polignac number, because 642896889 - 2⁵ = 642896857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642896899) by changing a digit.

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, 947887 + ... + 948564.

It is an arithmetic number, because the mean of its divisors is an integer number (108097764).

Almost surely, 2^642896889 is an apocalyptic number.

It is an amenable number.

642896889 is a deficient number, since it is larger than the sum of its proper divisors (221885223).

642896889 is a wasteful number, since it uses less digits than its factorization.

642896889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1896567.

The product of its digits is 11943936, while the sum is 60.

The square root of 642896889 is about 25355.4114342481. The cubic root of 642896889 is about 863.0721604141.

The spelling of 642896889 in words is "six hundred forty-two million, eight hundred ninety-six thousand, eight hundred eighty-nine".