660694320 has 800 divisors, whose sum is σ = 2903814144. Its totient is φ = 136857600.

The previous prime is 660694313. The next prime is 660694357. The reversal of 660694320 is 23496066.

660694320 is a `hidden beast` number, since 6 + 606 + 9 + 43 + 2 + 0 = 666.

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

It is a congruent number.

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 159 ways as a sum of consecutive naturals, for example, 21312705 + ... + 21312735.

Almost surely, 2^660694320 is an apocalyptic number.

660694320 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 660694320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1451907072).

660694320 is an abundant number, since it is smaller than the sum of its proper divisors (2243119824).

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

660694320 is a wasteful number, since it uses less digits than its factorization.

660694320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103 (or 88 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The square root of 660694320 is about 25703.9747899036. The cubic root of 660694320 is about 870.9639731259.

The spelling of 660694320 in words is "six hundred sixty million, six hundred ninety-four thousand, three hundred twenty".