664475800 has 24 divisors (see below), whose sum is σ = 1544906700. Its totient is φ = 265790240.

The previous prime is 664475761. The next prime is 664475837. The reversal of 664475800 is 8574466.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1660990 + ... + 1661389.

Almost surely, 2^664475800 is an apocalyptic number.

It is an amenable number.

664475800 is an abundant number, since it is smaller than the sum of its proper divisors (880430900).

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

664475800 is a wasteful number, since it uses less digits than its factorization.

664475800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3322395 (or 3322386 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 40.

The square root of 664475800 is about 25777.4281106553. The cubic root of 664475800 is about 872.6224653838.

The spelling of 664475800 in words is "six hundred sixty-four million, four hundred seventy-five thousand, eight hundred".