28917272 has 16 divisors (see below), whose sum is σ = 57409560. Its totient is φ = 13608064.

The previous prime is 28917269. The next prime is 28917281. The reversal of 28917272 is 27271982.

It is a super-3 number, since 3×28917272³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106178 + ... + 106449.

Almost surely, 2^28917272 is an apocalyptic number.

It is an amenable number.

28917272 is a deficient number, since it is larger than the sum of its proper divisors (28492288).

28917272 is a wasteful number, since it uses less digits than its factorization.

28917272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212650 (or 212646 counting only the distinct ones).

The product of its digits is 28224, while the sum is 38.

The square root of 28917272 is about 5377.4782193887. The cubic root of 28917272 is about 306.9392587798.

The spelling of 28917272 in words is "twenty-eight million, nine hundred seventeen thousand, two hundred seventy-two".