660761280 has 224 divisors, whose sum is σ = 2407188480. Its totient is φ = 170449920.

The previous prime is 660761279. The next prime is 660761327. The reversal of 660761280 is 82167066.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 31 ways as a sum of consecutive naturals, for example, 266607 + ... + 269073.

Almost surely, 2^660761280 is an apocalyptic number.

660761280 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 660761280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1203594240).

660761280 is an abundant number, since it is smaller than the sum of its proper divisors (1746427200).

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

660761280 is a wasteful number, since it uses less digits than its factorization.

660761280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2524 (or 2508 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 660761280 is about 25705.2772791892. The cubic root of 660761280 is about 870.9933955964.

The spelling of 660761280 in words is "six hundred sixty million, seven hundred sixty-one thousand, two hundred eighty".