660395520 has 120 divisors (see below), whose sum is σ = 2287215216. Its totient is φ = 176099328.

The previous prime is 660395501. The next prime is 660395539. The reversal of 660395520 is 25593066.

It is an interprime number because it is at equal distance from previous prime (660395501) and next prime (660395539).

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×660395520² = 872244485672140800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8709 + ... + 37371.

Almost surely, 2^660395520 is an apocalyptic number.

660395520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660395520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1143607608).

660395520 is an abundant number, since it is smaller than the sum of its proper divisors (1626819696).

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

660395520 is a wasteful number, since it uses less digits than its factorization.

660395520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28692 (or 28673 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The square root of 660395520 is about 25698.1618019655. The cubic root of 660395520 is about 870.8326550720.

The spelling of 660395520 in words is "six hundred sixty million, three hundred ninety-five thousand, five hundred twenty".