28279912 has 8 divisors (see below), whose sum is σ = 53024850. Its totient is φ = 14139952.

The previous prime is 28279871. The next prime is 28279913. The reversal of 28279912 is 21997282.

It can be written as a sum of positive squares in only one way, i.e., 27185796 + 1094116 = 5214^2 + 1046^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (28279913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1767487 + ... + 1767502.

Almost surely, 2^28279912 is an apocalyptic number.

It is an amenable number.

28279912 is a deficient number, since it is larger than the sum of its proper divisors (24744938).

28279912 is a wasteful number, since it uses less digits than its factorization.

28279912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3534995 (or 3534991 counting only the distinct ones).

The product of its digits is 36288, while the sum is 40.

The square root of 28279912 is about 5317.8860461653. The cubic root of 28279912 is about 304.6674221282.

The spelling of 28279912 in words is "twenty-eight million, two hundred seventy-nine thousand, nine hundred twelve".