22791816 has 48 divisors (see below), whose sum is σ = 62524800. Its totient is φ = 7499232.

The previous prime is 22791803. The next prime is 22791823. The reversal of 22791816 is 61819722.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3685 + ... + 7691.

It is an arithmetic number, because the mean of its divisors is an integer number (1302600).

Almost surely, 2^22791816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22791816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31262400).

22791816 is an abundant number, since it is smaller than the sum of its proper divisors (39732984).

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

22791816 is a wasteful number, since it uses less digits than its factorization.

22791816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4098 (or 4091 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 22791816 is about 4774.0775025129. The cubic root of 22791816 is about 283.5260560395.

It can be divided in two parts, 2279 and 1816, that added together give a triangular number (4095 = T₉₀).

The spelling of 22791816 in words is "twenty-two million, seven hundred ninety-one thousand, eight hundred sixteen".