22781828 has 6 divisors (see below), whose sum is σ = 39868206. Its totient is φ = 11390912.

The previous prime is 22781821. The next prime is 22781833. The reversal of 22781828 is 82818722.

It can be written as a sum of positive squares in only one way, i.e., 11505664 + 11276164 = 3392^2 + 3358^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22781791 and 22781800.

It is not an unprimeable number, because it can be changed into a prime (22781821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2847725 + ... + 2847732.

It is an arithmetic number, because the mean of its divisors is an integer number (6644701).

Almost surely, 2^22781828 is an apocalyptic number.

It is an amenable number.

22781828 is a deficient number, since it is larger than the sum of its proper divisors (17086378).

22781828 is a wasteful number, since it uses less digits than its factorization.

22781828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5695461 (or 5695459 counting only the distinct ones).

The product of its digits is 28672, while the sum is 38.

The square root of 22781828 is about 4773.0313219169. The cubic root of 22781828 is about 283.4846336855.

The spelling of 22781828 in words is "twenty-two million, seven hundred eighty-one thousand, eight hundred twenty-eight".