664603990 has 16 divisors (see below), whose sum is σ = 1228619952. Its totient is φ = 258656544.

The previous prime is 664603987. The next prime is 664603997. The reversal of 664603990 is 99306466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664603997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 897744 + ... + 898483.

It is an arithmetic number, because the mean of its divisors is an integer number (76788747).

Almost surely, 2^664603990 is an apocalyptic number.

664603990 is a deficient number, since it is larger than the sum of its proper divisors (564015962).

664603990 is a wasteful number, since it uses less digits than its factorization.

664603990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1796271.

The product of its (nonzero) digits is 209952, while the sum is 43.

The square root of 664603990 is about 25779.9144684384. The cubic root of 664603990 is about 872.6785769238.

The spelling of 664603990 in words is "six hundred sixty-four million, six hundred three thousand, nine hundred ninety".