28774227 has 18 divisors (see below), whose sum is σ = 40741092. Its totient is φ = 18061704.

The previous prime is 28774211. The next prime is 28774243. The reversal of 28774227 is 72247782.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28774211) and next prime (28774243).

It is not a de Polignac number, because 28774227 - 2⁴ = 28774211 is a prime.

It is a super-2 number, since 2×28774227² = 1655912278895058, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28774297) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 176448 + ... + 176610.

It is an arithmetic number, because the mean of its divisors is an integer number (2263394).

Almost surely, 2^28774227 is an apocalyptic number.

28774227 is a deficient number, since it is larger than the sum of its proper divisors (11966865).

28774227 is an equidigital number, since it uses as much as digits as its factorization.

28774227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367 (or 185 counting only the distinct ones).

The product of its digits is 87808, while the sum is 39.

The square root of 28774227 is about 5364.1613510408. The cubic root of 28774227 is about 306.4323100530.

The spelling of 28774227 in words is "twenty-eight million, seven hundred seventy-four thousand, two hundred twenty-seven".