646533888 has 432 divisors, whose sum is σ = 2392755456. Its totient is φ = 149667840.

The previous prime is 646533883. The next prime is 646533889. The reversal of 646533888 is 888335646.

Its product of digits (3317760) is a multiple of the sum of its prime factors (108).

It is a self number, because there is not a number n which added to its sum of digits gives 646533888.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646533883) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22294258 + ... + 22294286.

Almost surely, 2^646533888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646533888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1196377728).

646533888 is an abundant number, since it is smaller than the sum of its proper divisors (1746221568).

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

646533888 is a wasteful number, since it uses less digits than its factorization.

646533888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 65 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 51.

The square root of 646533888 is about 25427.0306563704. The cubic root of 646533888 is about 864.6966261019.

The spelling of 646533888 in words is "six hundred forty-six million, five hundred thirty-three thousand, eight hundred eighty-eight".