921368660 has 12 divisors (see below), whose sum is σ = 1934874228. Its totient is φ = 368547456.

The previous prime is 921368647. The next prime is 921368663. The reversal of 921368660 is 66863129.

It can be written as a sum of positive squares in 2 ways, for example, as 532963396 + 388405264 = 23086^2 + 19708^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921368663) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 23034197 + ... + 23034236.

It is an arithmetic number, because the mean of its divisors is an integer number (161239519).

Almost surely, 2^921368660 is an apocalyptic number.

It is an amenable number.

921368660 is an abundant number, since it is smaller than the sum of its proper divisors (1013505568).

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

921368660 is a wasteful number, since it uses less digits than its factorization.

921368660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46068442 (or 46068440 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 921368660 is about 30354.0550832998. The cubic root of 921368660 is about 973.0708855904.

The spelling of 921368660 in words is "nine hundred twenty-one million, three hundred sixty-eight thousand, six hundred sixty".