28224972 has 36 divisors (see below), whose sum is σ = 71518720. Its totient is φ = 9385632.

The previous prime is 28224971. The next prime is 28225003. The reversal of 28224972 is 27942282.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is not an unprimeable number, because it can be changed into a prime (28224971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21429 + ... + 22707.

Almost surely, 2^28224972 is an apocalyptic number.

It is an amenable number.

28224972 is an abundant number, since it is smaller than the sum of its proper divisors (43293748).

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

28224972 is a wasteful number, since it uses less digits than its factorization.

28224972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1902 (or 1897 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 28224972 is about 5312.7179484704. The cubic root of 28224972 is about 304.4699995519.

The spelling of 28224972 in words is "twenty-eight million, two hundred twenty-four thousand, nine hundred seventy-two".