660072 has 32 divisors (see below), whose sum is σ = 1886400. Its totient is φ = 188544.

The previous prime is 660071. The next prime is 660073. The reversal of 660072 is 270066.

It is an interprime number because it is at equal distance from previous prime (660071) and next prime (660073).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (660071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1797 + ... + 2132.

It is an arithmetic number, because the mean of its divisors is an integer number (58950).

2⁶⁶⁰⁰⁷² is an apocalyptic number.

It is an amenable number.

660072 is an abundant number, since it is smaller than the sum of its proper divisors (1226328).

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

660072 is a wasteful number, since it uses less digits than its factorization.

660072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3945 (or 3941 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 660072 is about 812.4481521919. The cubic root of 660072 is about 87.0690428285.

The spelling of 660072 in words is "six hundred sixty thousand, seventy-two".