664001888 has 96 divisors (see below), whose sum is σ = 1475832960. Its totient is φ = 291456000.

The previous prime is 664001857. The next prime is 664001903. The reversal of 664001888 is 888100466.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2005883 + ... + 2006213.

It is an arithmetic number, because the mean of its divisors is an integer number (15373260).

Almost surely, 2^664001888 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 664001888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (737916480).

664001888 is an abundant number, since it is smaller than the sum of its proper divisors (811831072).

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

664001888 is a wasteful number, since it uses less digits than its factorization.

664001888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532 (or 524 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 41.

The square root of 664001888 is about 25768.2340877290. The cubic root of 664001888 is about 872.4149611566.

The spelling of 664001888 in words is "six hundred sixty-four million, one thousand, eight hundred eighty-eight".