28286772 has 12 divisors (see below), whose sum is σ = 66002496. Its totient is φ = 9428920.

The previous prime is 28286771. The next prime is 28286777. The reversal of 28286772 is 27768282.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28286771) 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, 1178604 + ... + 1178627.

It is an arithmetic number, because the mean of its divisors is an integer number (5500208).

Almost surely, 2^28286772 is an apocalyptic number.

It is an amenable number.

28286772 is an abundant number, since it is smaller than the sum of its proper divisors (37715724).

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

28286772 is a wasteful number, since it uses less digits than its factorization.

28286772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2357238 (or 2357236 counting only the distinct ones).

The product of its digits is 150528, while the sum is 42.

The square root of 28286772 is about 5318.5310001917. The cubic root of 28286772 is about 304.6920550378.

The spelling of 28286772 in words is "twenty-eight million, two hundred eighty-six thousand, seven hundred seventy-two".