660959838 has 120 divisors (see below), whose sum is σ = 1860865776. Its totient is φ = 171642240.

The previous prime is 660959833. The next prime is 660959861. The reversal of 660959838 is 838959066.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660959833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 134806 + ... + 139622.

Almost surely, 2^660959838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660959838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (930432888).

660959838 is an abundant number, since it is smaller than the sum of its proper divisors (1199905938).

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

660959838 is a wasteful number, since it uses less digits than its factorization.

660959838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4860 (or 4840 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The square root of 660959838 is about 25709.1391921239. The cubic root of 660959838 is about 871.0806310281.

The spelling of 660959838 in words is "six hundred sixty million, nine hundred fifty-nine thousand, eight hundred thirty-eight".