664528450 has 24 divisors (see below), whose sum is σ = 1264771728. Its totient is φ = 259628880.

The previous prime is 664528433. The next prime is 664528511. The reversal of 664528450 is 54825466.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 152392 + ... + 156691.

It is an arithmetic number, because the mean of its divisors is an integer number (52698822).

Almost surely, 2^664528450 is an apocalyptic number.

664528450 is a deficient number, since it is larger than the sum of its proper divisors (600243278).

664528450 is a wasteful number, since it uses less digits than its factorization.

664528450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309138 (or 309133 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 40.

The square root of 664528450 is about 25778.4493327275. The cubic root of 664528450 is about 872.6455123026.

The spelling of 664528450 in words is "six hundred sixty-four million, five hundred twenty-eight thousand, four hundred fifty".