646938888 has 32 divisors (see below), whose sum is σ = 1626293760. Its totient is φ = 214453440.

The previous prime is 646938883. The next prime is 646938911. The reversal of 646938888 is 888839646.

It is not an unprimeable number, because it can be changed into a prime (646938883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70120 + ... + 78807.

It is an arithmetic number, because the mean of its divisors is an integer number (50821680).

Almost surely, 2^646938888 is an apocalyptic number.

It is an amenable number.

646938888 is an abundant number, since it is smaller than the sum of its proper divisors (979354872).

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

646938888 is a wasteful number, since it uses less digits than its factorization.

646938888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149117 (or 149113 counting only the distinct ones).

The product of its digits is 15925248, while the sum is 60.

The square root of 646938888 is about 25434.9933752694. The cubic root of 646938888 is about 864.8771420507.

The spelling of 646938888 in words is "six hundred forty-six million, nine hundred thirty-eight thousand, eight hundred eighty-eight".