921240680 has 32 divisors (see below), whose sum is σ = 2144269800. Its totient is φ = 355789056.

The previous prime is 921240679. The next prime is 921240703. The reversal of 921240680 is 86042129.

It can be written as a sum of positive squares in 4 ways, for example, as 811452196 + 109788484 = 28486^2 + 10478^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395927 + ... + 398246.

Almost surely, 2^921240680 is an apocalyptic number.

It is an amenable number.

921240680 is an abundant number, since it is smaller than the sum of its proper divisors (1223029120).

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

921240680 is a wasteful number, since it uses less digits than its factorization.

921240680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794213 (or 794209 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 921240680 is about 30351.9468897796. The cubic root of 921240680 is about 973.0258296558.

The spelling of 921240680 in words is "nine hundred twenty-one million, two hundred forty thousand, six hundred eighty".