22408728 has 32 divisors (see below), whose sum is σ = 56367360. Its totient is φ = 7423520.

The previous prime is 22408709. The next prime is 22408747. The reversal of 22408728 is 82780422.

It is an interprime number because it is at equal distance from previous prime (22408709) and next prime (22408747).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1213 + ... + 6803.

It is an arithmetic number, because the mean of its divisors is an integer number (1761480).

Almost surely, 2^22408728 is an apocalyptic number.

It is an amenable number.

22408728 is an abundant number, since it is smaller than the sum of its proper divisors (33958632).

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

22408728 is a wasteful number, since it uses less digits than its factorization.

22408728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5767 (or 5763 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 33.

The square root of 22408728 is about 4733.7857999703. The cubic root of 22408728 is about 281.9285569232.

It can be divided in two parts, 224087 and 28, that added together give a triangular number (224115 = T₆₆₉).

The spelling of 22408728 in words is "twenty-two million, four hundred eight thousand, seven hundred twenty-eight".