28069312 has 28 divisors (see below), whose sum is σ = 58978800. Its totient is φ = 13208576.

The previous prime is 28069267. The next prime is 28069331. The reversal of 28069312 is 21396082.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11812 + ... + 13987.

Almost surely, 2^28069312 is an apocalyptic number.

It is an amenable number.

28069312 is an abundant number, since it is smaller than the sum of its proper divisors (30909488).

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

28069312 is a wasteful number, since it uses less digits than its factorization.

28069312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25828 (or 25818 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 28069312 is about 5298.0479424029. The cubic root of 28069312 is about 303.9092526920.

The spelling of 28069312 in words is "twenty-eight million, sixty-nine thousand, three hundred twelve".