660385884 has 24 divisors (see below), whose sum is σ = 1543682448. Its totient is φ = 219731200.

The previous prime is 660385871. The next prime is 660385889. The reversal of 660385884 is 488583066.

660385884 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×660385884² = 872219031572922912, which contains 22 as substring.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660385889) 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, 42717 + ... + 56084.

It is an arithmetic number, because the mean of its divisors is an integer number (64320102).

Almost surely, 2^660385884 is an apocalyptic number.

It is an amenable number.

660385884 is an abundant number, since it is smaller than the sum of its proper divisors (883296564).

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

660385884 is a wasteful number, since it uses less digits than its factorization.

660385884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99365 (or 99363 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 48.

The square root of 660385884 is about 25697.9743170546. The cubic root of 660385884 is about 870.8284195374.

The spelling of 660385884 in words is "six hundred sixty million, three hundred eighty-five thousand, eight hundred eighty-four".