660727746 has 128 divisors (see below), whose sum is σ = 1788480000. Its totient is φ = 176504832.

The previous prime is 660727703. The next prime is 660727757. The reversal of 660727746 is 647727066.

It is a super-2 number, since 2×660727746² = 873122308668481032, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1471330 + ... + 1471778.

It is an arithmetic number, because the mean of its divisors is an integer number (13972500).

Almost surely, 2^660727746 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660727746, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (894240000).

660727746 is an abundant number, since it is smaller than the sum of its proper divisors (1127752254).

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

660727746 is a wasteful number, since it uses less digits than its factorization.

660727746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713 (or 707 counting only the distinct ones).

The product of its (nonzero) digits is 592704, while the sum is 45.

The square root of 660727746 is about 25704.6249924017. The cubic root of 660727746 is about 870.9786608818.

The spelling of 660727746 in words is "six hundred sixty million, seven hundred twenty-seven thousand, seven hundred forty-six".