28774272 has 32 divisors (see below), whose sum is σ = 76432680. Its totient is φ = 9591296.

The previous prime is 28774259. The next prime is 28774297. The reversal of 28774272 is 27247782.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 28774272.

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, 37083 + ... + 37850.

Almost surely, 2^28774272 is an apocalyptic number.

It is an amenable number.

28774272 is an abundant number, since it is smaller than the sum of its proper divisors (47658408).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28774272 is an equidigital number, since it uses as much as digits as its factorization.

28774272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74950 (or 74938 counting only the distinct ones).

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

The square root of 28774272 is about 5364.1655455439. The cubic root of 28774272 is about 306.4324697960.

The spelling of 28774272 in words is "twenty-eight million, seven hundred seventy-four thousand, two hundred seventy-two".