28229157 has 24 divisors (see below), whose sum is σ = 44673408. Its totient is φ = 17035200.

The previous prime is 28229141. The next prime is 28229161. The reversal of 28229157 is 75192282.

It is not a de Polignac number, because 28229157 - 2⁴ = 28229141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28229857) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30532 + ... + 31442.

It is an arithmetic number, because the mean of its divisors is an integer number (1861392).

Almost surely, 2^28229157 is an apocalyptic number.

It is an amenable number.

28229157 is a deficient number, since it is larger than the sum of its proper divisors (16444251).

28229157 is a wasteful number, since it uses less digits than its factorization.

28229157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241 (or 1238 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 28229157 is about 5313.1118000659. Note that the first 3 decimals coincide. The cubic root of 28229157 is about 304.4850470304.

The spelling of 28229157 in words is "twenty-eight million, two hundred twenty-nine thousand, one hundred fifty-seven".