660731214 has 128 divisors (see below), whose sum is σ = 1664312832. Its totient is φ = 171786240.

The previous prime is 660731209. The next prime is 660731257. The reversal of 660731214 is 412137066.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1414609 + ... + 1415075.

It is an arithmetic number, because the mean of its divisors is an integer number (13002444).

Almost surely, 2^660731214 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660731214, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (832156416).

660731214 is an abundant number, since it is smaller than the sum of its proper divisors (1003581618).

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

660731214 is a wasteful number, since it uses less digits than its factorization.

660731214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 660731214 is about 25704.6924509903. The cubic root of 660731214 is about 870.9801847312.

The spelling of 660731214 in words is "six hundred sixty million, seven hundred thirty-one thousand, two hundred fourteen".