660915 has 24 divisors (see below), whose sum is σ = 1207440. Its totient is φ = 333504.

The previous prime is 660901. The next prime is 660917. The reversal of 660915 is 519066.

660915 is digitally balanced in base 2 and base 7, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 660915 - 2⁴ = 660899 is a prime.

660915 is strictly pandigital in base 7.

It is not an unprimeable number, because it can be changed into a prime (660917) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 469 + ... + 1241.

It is an arithmetic number, because the mean of its divisors is an integer number (50310).

2⁶⁶⁰⁹¹⁵ is an apocalyptic number.

660915 is a deficient number, since it is larger than the sum of its proper divisors (546525).

660915 is a wasteful number, since it uses less digits than its factorization.

660915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803 (or 800 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 660915 is about 812.9667889896. The cubic root of 660915 is about 87.1060933212.

The spelling of 660915 in words is "six hundred sixty thousand, nine hundred fifteen".