866220290 has 32 divisors (see below), whose sum is σ = 1733308416. Its totient is φ = 309516480.

The previous prime is 866220269. The next prime is 866220347. The reversal of 866220290 is 92022668.

It is a self number, because there is not a number n which added to its sum of digits gives 866220290.

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 15 ways as a sum of consecutive naturals, for example, 103442 + ... + 111501.

It is an arithmetic number, because the mean of its divisors is an integer number (54165888).

Almost surely, 2^866220290 is an apocalyptic number.

866220290 is an abundant number, since it is smaller than the sum of its proper divisors (867088126).

866220290 is a wasteful number, since it uses less digits than its factorization.

866220290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214994.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 866220290 is about 29431.6205805932. The cubic root of 866220290 is about 953.2557876460.

The spelling of 866220290 in words is "eight hundred sixty-six million, two hundred twenty thousand, two hundred ninety".