28263388 has 6 divisors (see below), whose sum is σ = 49460936. Its totient is φ = 14131692.

The previous prime is 28263383. The next prime is 28263407. The reversal of 28263388 is 88336282.

It is a self number, because there is not a number n which added to its sum of digits gives 28263388.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28263383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3532920 + ... + 3532927.

Almost surely, 2^28263388 is an apocalyptic number.

It is an amenable number.

28263388 is a deficient number, since it is larger than the sum of its proper divisors (21197548).

28263388 is a wasteful number, since it uses less digits than its factorization.

28263388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7065851 (or 7065849 counting only the distinct ones).

The product of its digits is 110592, while the sum is 40.

The square root of 28263388 is about 5316.3321942858. The cubic root of 28263388 is about 304.6080713386.

The spelling of 28263388 in words is "twenty-eight million, two hundred sixty-three thousand, three hundred eighty-eight".