657668990 has 16 divisors (see below), whose sum is σ = 1291422960. Its totient is φ = 239152320.

The previous prime is 657668959. The next prime is 657669007. The reversal of 657668990 is 99866756.

657668990 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2989295 + ... + 2989514.

It is an arithmetic number, because the mean of its divisors is an integer number (80713935).

Almost surely, 2^657668990 is an apocalyptic number.

657668990 is a deficient number, since it is larger than the sum of its proper divisors (633753970).

657668990 is a wasteful number, since it uses less digits than its factorization.

657668990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5978827.

The product of its (nonzero) digits is 4898880, while the sum is 56.

The square root of 657668990 is about 25645.0578084745. The cubic root of 657668990 is about 869.6325528049.

The spelling of 657668990 in words is "six hundred fifty-seven million, six hundred sixty-eight thousand, nine hundred ninety".