660734844 has 192 divisors, whose sum is σ = 1999613952. Its totient is φ = 164851200.

The previous prime is 660734813. The next prime is 660734849. The reversal of 660734844 is 448437066.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 660734796 and 660734805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660734849) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4053507 + ... + 4053669.

It is an arithmetic number, because the mean of its divisors is an integer number (10414656).

Almost surely, 2^660734844 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 660734844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (999806976).

660734844 is an abundant number, since it is smaller than the sum of its proper divisors (1338879108).

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

660734844 is a wasteful number, since it uses less digits than its factorization.

660734844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336 (or 334 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 42.

The square root of 660734844 is about 25704.7630605691. The cubic root of 660734844 is about 870.9817797582.

The spelling of 660734844 in words is "six hundred sixty million, seven hundred thirty-four thousand, eight hundred forty-four".