807216660 has 72 divisors (see below), whose sum is σ = 2488731336. Its totient is φ = 211726080.

The previous prime is 807216649. The next prime is 807216677. The reversal of 807216660 is 66612708.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 64545156 + 742671504 = 8034^2 + 27252^2 .

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 (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25779 + ... + 47738.

It is an arithmetic number, because the mean of its divisors is an integer number (34565713).

Almost surely, 2^807216660 is an apocalyptic number.

It is an amenable number.

807216660 is an abundant number, since it is smaller than the sum of its proper divisors (1681514676).

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

807216660 is a wasteful number, since it uses less digits than its factorization.

807216660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73593 (or 73588 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 807216660 is about 28411.5585633735. The cubic root of 807216660 is about 931.1008123398.

The spelling of 807216660 in words is "eight hundred seven million, two hundred sixteen thousand, six hundred sixty".