660215260 has 12 divisors (see below), whose sum is σ = 1386452088. Its totient is φ = 264086096.

The previous prime is 660215221. The next prime is 660215263. The reversal of 660215260 is 62512066.

It is a super-3 number, since 3×660215260³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660215263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16505362 + ... + 16505401.

It is an arithmetic number, because the mean of its divisors is an integer number (115537674).

Almost surely, 2^660215260 is an apocalyptic number.

It is an amenable number.

660215260 is an abundant number, since it is smaller than the sum of its proper divisors (726236828).

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

660215260 is a wasteful number, since it uses less digits than its factorization.

660215260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33010772 (or 33010770 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 660215260 is about 25694.6543078517. The cubic root of 660215260 is about 870.7534143874.

The spelling of 660215260 in words is "six hundred sixty million, two hundred fifteen thousand, two hundred sixty".