22291776 has 126 divisors (see below), whose sum is σ = 69490590. Its totient is φ = 6829056.

The previous prime is 22291739. The next prime is 22291813. The reversal of 22291776 is 67719222.

It is an interprime number because it is at equal distance from previous prime (22291739) and next prime (22291813).

It can be written as a sum of positive squares in 3 ways, for example, as 1498176 + 20793600 = 1224^2 + 4560^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 22291776.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 97230 + ... + 97458.

Almost surely, 2^22291776 is an apocalyptic number.

22291776 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22291776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34745295).

22291776 is an abundant number, since it is smaller than the sum of its proper divisors (47198814).

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

22291776 is a wasteful number, since it uses less digits than its factorization.

22291776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273 (or 247 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 22291776 is about 4721.4167365315. The cubic root of 22291776 is about 281.4372359168.

It can be divided in two parts, 2229 and 1776, that added together give a triangular number (4005 = T₈₉).

The spelling of 22291776 in words is "twenty-two million, two hundred ninety-one thousand, seven hundred seventy-six".