28280884 has 6 divisors (see below), whose sum is σ = 49491554. Its totient is φ = 14140440.

The previous prime is 28280867. The next prime is 28280893. The reversal of 28280884 is 48808282.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19448100 + 8832784 = 4410^2 + 2972^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3535107 + ... + 3535114.

Almost surely, 2^28280884 is an apocalyptic number.

It is an amenable number.

28280884 is a deficient number, since it is larger than the sum of its proper divisors (21210670).

28280884 is a wasteful number, since it uses less digits than its factorization.

28280884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7070225 (or 7070223 counting only the distinct ones).

The product of its (nonzero) digits is 65536, while the sum is 40.

The square root of 28280884 is about 5317.9774350781. The cubic root of 28280884 is about 304.6709126311.

The spelling of 28280884 in words is "twenty-eight million, two hundred eighty thousand, eight hundred eighty-four".