28224747 has 32 divisors (see below), whose sum is σ = 45235200. Its totient is φ = 17332704.

The previous prime is 28224739. The next prime is 28224751. The reversal of 28224747 is 74742282.

It is not a de Polignac number, because 28224747 - 2³ = 28224739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28224737) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18238 + ... + 19724.

It is an arithmetic number, because the mean of its divisors is an integer number (1413600).

Almost surely, 2^28224747 is an apocalyptic number.

28224747 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28224747 is a deficient number, since it is larger than the sum of its proper divisors (17010453).

28224747 is a wasteful number, since it uses less digits than its factorization.

28224747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1552 (or 1546 counting only the distinct ones).

The product of its digits is 50176, while the sum is 36.

The square root of 28224747 is about 5312.6967728264. The cubic root of 28224747 is about 304.4691905055.

It can be divided in two parts, 2822 and 4747, that added together give a square (7569 = 87²).

The spelling of 28224747 in words is "twenty-eight million, two hundred twenty-four thousand, seven hundred forty-seven".