28263812 has 6 divisors (see below), whose sum is σ = 49461678. Its totient is φ = 14131904.

The previous prime is 28263797. The next prime is 28263817. The reversal of 28263812 is 21836282.

It can be written as a sum of positive squares in only one way, i.e., 23658496 + 4605316 = 4864^2 + 2146^2 .

It is not an unprimeable number, because it can be changed into a prime (28263817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3532973 + ... + 3532980.

It is an arithmetic number, because the mean of its divisors is an integer number (8243613).

Almost surely, 2^28263812 is an apocalyptic number.

It is an amenable number.

28263812 is a deficient number, since it is larger than the sum of its proper divisors (21197866).

28263812 is a wasteful number, since it uses less digits than its factorization.

28263812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7065957 (or 7065955 counting only the distinct ones).

The product of its digits is 9216, while the sum is 32.

The square root of 28263812 is about 5316.3720712531. The cubic root of 28263812 is about 304.6095945480.

The spelling of 28263812 in words is "twenty-eight million, two hundred sixty-three thousand, eight hundred twelve".