22077891 has 12 divisors (see below), whose sum is σ = 34789560. Its totient is φ = 13380480.

The previous prime is 22077871. The next prime is 22077899. The reversal of 22077891 is 19877022.

It is not a de Polignac number, because 22077891 - 2¹⁷ = 21946819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22077899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111406 + ... + 111603.

It is an arithmetic number, because the mean of its divisors is an integer number (2899130).

Almost surely, 2^22077891 is an apocalyptic number.

22077891 is a deficient number, since it is larger than the sum of its proper divisors (12711669).

22077891 is a wasteful number, since it uses less digits than its factorization.

22077891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223026 (or 223023 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 22077891 is about 4698.7116319264. The cubic root of 22077891 is about 280.5342309069.

The spelling of 22077891 in words is "twenty-two million, seventy-seven thousand, eight hundred ninety-one".