664535250 has 96 divisors (see below), whose sum is σ = 1805341824. Its totient is φ = 176378400.

The previous prime is 664535243. The next prime is 664535269. The reversal of 664535250 is 52535466.

It is a happy number.

664535250 is a `hidden beast` number, since 6 + 645 + 3 + 5 + 2 + 5 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 591189 + ... + 592311.

It is an arithmetic number, because the mean of its divisors is an integer number (18805644).

Almost surely, 2^664535250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664535250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (902670912).

664535250 is an abundant number, since it is smaller than the sum of its proper divisors (1140806574).

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

664535250 is a wasteful number, since it uses less digits than its factorization.

664535250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1409 (or 1396 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

The square root of 664535250 is about 25778.5812255058. The cubic root of 664535250 is about 872.6484888339.

The spelling of 664535250 in words is "six hundred sixty-four million, five hundred thirty-five thousand, two hundred fifty".