7866821920 has 48 divisors (see below), whose sum is σ = 18659507328. Its totient is φ = 3134176000.

The previous prime is 7866821903. The next prime is 7866821969. The reversal of 7866821920 is 291286687.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57784 + ... + 138103.

It is an arithmetic number, because the mean of its divisors is an integer number (388739736).

Almost surely, 2^7866821920 is an apocalyptic number.

It is an amenable number.

7866821920 is an abundant number, since it is smaller than the sum of its proper divisors (10792685408).

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

7866821920 is a wasteful number, since it uses less digits than its factorization.

7866821920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196153 (or 196145 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 49.

The square root of 7866821920 is about 88695.1065166506. The cubic root of 7866821920 is about 1988.8396659767.

The spelling of 7866821920 in words is "seven billion, eight hundred sixty-six million, eight hundred twenty-one thousand, nine hundred twenty".