664790550 has 48 divisors (see below), whose sum is σ = 1651752912. Its totient is φ = 176947200.

The previous prime is 664790521. The next prime is 664790557. The reversal of 664790550 is 55097466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664790557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82710 + ... + 90390.

It is an arithmetic number, because the mean of its divisors is an integer number (34411519).

Almost surely, 2^664790550 is an apocalyptic number.

664790550 is an abundant number, since it is smaller than the sum of its proper divisors (986962362).

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

664790550 is a wasteful number, since it uses less digits than its factorization.

664790550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8273 (or 8268 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 42.

The square root of 664790550 is about 25783.5325353218. The cubic root of 664790550 is about 872.7602253873.

The spelling of 664790550 in words is "six hundred sixty-four million, seven hundred ninety thousand, five hundred fifty".