28151224 has 16 divisors (see below), whose sum is σ = 54486720. Its totient is φ = 13621440.

The previous prime is 28151213. The next prime is 28151251. The reversal of 28151224 is 42215182.

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, 56509 + ... + 57004.

It is an arithmetic number, because the mean of its divisors is an integer number (3405420).

Almost surely, 2^28151224 is an apocalyptic number.

It is an amenable number.

28151224 is a deficient number, since it is larger than the sum of its proper divisors (26335496).

28151224 is a wasteful number, since it uses less digits than its factorization.

28151224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113550 (or 113546 counting only the distinct ones).

The product of its digits is 1280, while the sum is 25.

The square root of 28151224 is about 5305.7727052711. The cubic root of 28151224 is about 304.2045887374.

The spelling of 28151224 in words is "twenty-eight million, one hundred fifty-one thousand, two hundred twenty-four".