28489228 has 6 divisors (see below), whose sum is σ = 49856156. Its totient is φ = 14244612.

The previous prime is 28489211. The next prime is 28489231. The reversal of 28489228 is 82298482.

It is a happy number.

It is a super-2 number, since 2×28489228² = 1623272224071968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3561150 + ... + 3561157.

Almost surely, 2^28489228 is an apocalyptic number.

It is an amenable number.

28489228 is a deficient number, since it is larger than the sum of its proper divisors (21366928).

28489228 is a wasteful number, since it uses less digits than its factorization.

28489228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7122311 (or 7122309 counting only the distinct ones).

The product of its digits is 147456, while the sum is 43.

The square root of 28489228 is about 5337.5301404301. The cubic root of 28489228 is about 305.4172485146.

It can be divided in two parts, 2848922 and 8, that multiplied together give a triangular number (22791376 = T₆₇₅₁).

The spelling of 28489228 in words is "twenty-eight million, four hundred eighty-nine thousand, two hundred twenty-eight".