28785272 has 16 divisors (see below), whose sum is σ = 54030240. Its totient is φ = 14377216.

The previous prime is 28785271. The next prime is 28785283. The reversal of 28785272 is 27258782.

It is a happy number.

It is a super-2 number, since 2×28785272² = 1657183768227968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28785271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11528 + ... + 13800.

It is an arithmetic number, because the mean of its divisors is an integer number (3376890).

Almost surely, 2^28785272 is an apocalyptic number.

It is an amenable number.

28785272 is a deficient number, since it is larger than the sum of its proper divisors (25244968).

28785272 is a wasteful number, since it uses less digits than its factorization.

28785272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3862 (or 3858 counting only the distinct ones).

The product of its digits is 125440, while the sum is 41.

The square root of 28785272 is about 5365.1907701404. The cubic root of 28785272 is about 306.4715130975.

The spelling of 28785272 in words is "twenty-eight million, seven hundred eighty-five thousand, two hundred seventy-two".