9780390664 has 16 divisors (see below), whose sum is σ = 20005344720. Its totient is φ = 4445632080.

The previous prime is 9780390661. The next prime is 9780390667. The reversal of 9780390664 is 4660930879.

It is an interprime number because it is at equal distance from previous prime (9780390661) and next prime (9780390667).

It is not an unprimeable number, because it can be changed into a prime (9780390661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55570314 + ... + 55570489.

It is an arithmetic number, because the mean of its divisors is an integer number (1250334045).

Almost surely, 2^9780390664 is an apocalyptic number.

It is an amenable number.

9780390664 is an abundant number, since it is smaller than the sum of its proper divisors (10224954056).

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

9780390664 is a wasteful number, since it uses less digits than its factorization.

9780390664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111140820 (or 111140816 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 52.

The square root of 9780390664 is about 98895.8576685596. The cubic root of 9780390664 is about 2138.5466785389.

The spelling of 9780390664 in words is "nine billion, seven hundred eighty million, three hundred ninety thousand, six hundred sixty-four".