28281764 has 24 divisors (see below), whose sum is σ = 58094400. Its totient is φ = 11792736.

The previous prime is 28281749. The next prime is 28281767. The reversal of 28281764 is 46718282.

It is not an unprimeable number, because it can be changed into a prime (28281767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12614 + ... + 14685.

It is an arithmetic number, because the mean of its divisors is an integer number (2420600).

Almost surely, 2^28281764 is an apocalyptic number.

It is an amenable number.

28281764 is an abundant number, since it is smaller than the sum of its proper divisors (29812636).

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

28281764 is a wasteful number, since it uses less digits than its factorization.

28281764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27347 (or 27345 counting only the distinct ones).

The product of its digits is 43008, while the sum is 38.

The square root of 28281764 is about 5318.0601726569. The cubic root of 28281764 is about 304.6740726881.

The spelling of 28281764 in words is "twenty-eight million, two hundred eighty-one thousand, seven hundred sixty-four".