660386880 has 168 divisors, whose sum is σ = 2293754112. Its totient is φ = 174375936.

The previous prime is 660386861. The next prime is 660386891. The reversal of 660386880 is 88683066.

It is a super-2 number, since 2×660386880² = 872221662552268800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 307089 + ... + 309231.

Almost surely, 2^660386880 is an apocalyptic number.

660386880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660386880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1146877056).

660386880 is an abundant number, since it is smaller than the sum of its proper divisors (1633367232).

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

660386880 is a wasteful number, since it uses less digits than its factorization.

660386880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2273 (or 2260 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The square root of 660386880 is about 25697.9936960067. The cubic root of 660386880 is about 870.8288573342.

The spelling of 660386880 in words is "six hundred sixty million, three hundred eighty-six thousand, eight hundred eighty".