22821728 has 24 divisors (see below), whose sum is σ = 45045000. Its totient is φ = 11381760.

The previous prime is 22821703. The next prime is 22821737. The reversal of 22821728 is 82712822.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 22821694 and 22821703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17648 + ... + 18896.

It is an arithmetic number, because the mean of its divisors is an integer number (1876875).

Almost surely, 2^22821728 is an apocalyptic number.

It is an amenable number.

22821728 is a deficient number, since it is larger than the sum of its proper divisors (22223272).

22821728 is a wasteful number, since it uses less digits than its factorization.

22821728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1830 (or 1822 counting only the distinct ones).

The product of its digits is 7168, while the sum is 32.

The square root of 22821728 is about 4777.2092271534. The cubic root of 22821728 is about 283.6500351030.

The spelling of 22821728 in words is "twenty-two million, eight hundred twenty-one thousand, seven hundred twenty-eight".