28549072 has 30 divisors (see below), whose sum is σ = 57840482. Its totient is φ = 13649856.

The previous prime is 28549067. The next prime is 28549093. The reversal of 28549072 is 27094582.

It can be written as a sum of positive squares in only one way, i.e., 28472896 + 76176 = 5336^2 + 276^2 .

It is a super-2 number, since 2×28549072² = 1630099024122368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6778 + ... + 10150.

Almost surely, 2^28549072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28549072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28920241).

28549072 is an abundant number, since it is smaller than the sum of its proper divisors (29291410).

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

28549072 is a wasteful number, since it uses less digits than its factorization.

28549072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3427 (or 3398 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 28549072 is about 5343.1331632292. The cubic root of 28549072 is about 305.6309504210.

The spelling of 28549072 in words is "twenty-eight million, five hundred forty-nine thousand, seventy-two".