8721890406 has 32 divisors (see below), whose sum is σ = 19482426720. Its totient is φ = 2892229632.

The previous prime is 8721890383. The next prime is 8721890459. The reversal of 8721890406 is 6040981278.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 408015 + ... + 428858.

It is an arithmetic number, because the mean of its divisors is an integer number (608825835).

Almost surely, 2^8721890406 is an apocalyptic number.

8721890406 is an abundant number, since it is smaller than the sum of its proper divisors (10760536314).

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

8721890406 is a wasteful number, since it uses less digits than its factorization.

8721890406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837077 (or 837071 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 8721890406 is about 93391.0617029274. The cubic root of 8721890406 is about 2058.4336607059.

The spelling of 8721890406 in words is "eight billion, seven hundred twenty-one million, eight hundred ninety thousand, four hundred six".