664405750 has 32 divisors (see below), whose sum is σ = 1250724384. Its totient is φ = 264276000.

The previous prime is 664405741. The next prime is 664405801. The reversal of 664405750 is 57504466.

It is a happy number.

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, 37909 + ... + 52591.

It is an arithmetic number, because the mean of its divisors is an integer number (39085137).

Almost surely, 2^664405750 is an apocalyptic number.

664405750 is a deficient number, since it is larger than the sum of its proper divisors (586318634).

664405750 is a wasteful number, since it uses less digits than its factorization.

664405750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14881 (or 14871 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 37.

The square root of 664405750 is about 25776.0693279639. The cubic root of 664405750 is about 872.5917999320.

The spelling of 664405750 in words is "six hundred sixty-four million, four hundred five thousand, seven hundred fifty".