76921209 has 24 divisors (see below), whose sum is σ = 118171872. Its totient is φ = 48048000.

The previous prime is 76921193. The next prime is 76921213. The reversal of 76921209 is 90212967.

It is not a de Polignac number, because 76921209 - 2⁴ = 76921193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (76921279) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37402 + ... + 39404.

It is an arithmetic number, because the mean of its divisors is an integer number (4923828).

Almost surely, 2^76921209 is an apocalyptic number.

It is an amenable number.

76921209 is a deficient number, since it is larger than the sum of its proper divisors (41250663).

76921209 is a wasteful number, since it uses less digits than its factorization.

76921209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2277 (or 2274 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 76921209 is about 8770.4737044244. The cubic root of 76921209 is about 425.2869278131.

The spelling of 76921209 in words is "seventy-six million, nine hundred twenty-one thousand, two hundred nine".