660891364 has 72 divisors (see below), whose sum is σ = 1407493248. Its totient is φ = 265939200.

The previous prime is 660891317. The next prime is 660891367. The reversal of 660891364 is 463198066.

660891364 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 660891364.

It is not an unprimeable number, because it can be changed into a prime (660891367) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1526092 + ... + 1526524.

Almost surely, 2^660891364 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660891364, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (703746624).

660891364 is an abundant number, since it is smaller than the sum of its proper divisors (746601884).

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

660891364 is a wasteful number, since it uses less digits than its factorization.

660891364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633 (or 612 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 660891364 is about 25707.8074522119. The cubic root of 660891364 is about 871.0505493038.

The spelling of 660891364 in words is "six hundred sixty million, eight hundred ninety-one thousand, three hundred sixty-four".