22291816 has 8 divisors (see below), whose sum is σ = 41797170. Its totient is φ = 11145904.

The previous prime is 22291813. The next prime is 22291817. The reversal of 22291816 is 61819222.

It can be written as a sum of positive squares in only one way, i.e., 13351716 + 8940100 = 3654^2 + 2990^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (22291813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1393231 + ... + 1393246.

Almost surely, 2^22291816 is an apocalyptic number.

It is an amenable number.

22291816 is a deficient number, since it is larger than the sum of its proper divisors (19505354).

22291816 is a wasteful number, since it uses less digits than its factorization.

22291816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2786483 (or 2786479 counting only the distinct ones).

The product of its digits is 3456, while the sum is 31.

The square root of 22291816 is about 4721.4209725463. The cubic root of 22291816 is about 281.4374042522.

The spelling of 22291816 in words is "twenty-two million, two hundred ninety-one thousand, eight hundred sixteen".