660120624 has 80 divisors (see below), whose sum is σ = 1899704800. Its totient is φ = 219469824.

The previous prime is 660120619. The next prime is 660120641. The reversal of 660120624 is 426021066.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185292 + ... + 188820.

It is an arithmetic number, because the mean of its divisors is an integer number (23746310).

Almost surely, 2^660120624 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 660120624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (949852400).

660120624 is an abundant number, since it is smaller than the sum of its proper divisors (1239584176).

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

660120624 is a wasteful number, since it uses less digits than its factorization.

660120624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3979 (or 3967 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 660120624 is about 25692.8126914902. The cubic root of 660120624 is about 870.7118074739.

It can be divided in two parts, 6601 and 20624, that added together give a square (27225 = 165²).

The spelling of 660120624 in words is "six hundred sixty million, one hundred twenty thousand, six hundred twenty-four".