28661272 has 32 divisors (see below), whose sum is σ = 56919600. Its totient is φ = 13492224.

The previous prime is 28661257. The next prime is 28661317. The reversal of 28661272 is 27216682.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28848 + ... + 29824.

Almost surely, 2^28661272 is an apocalyptic number.

It is an amenable number.

28661272 is a deficient number, since it is larger than the sum of its proper divisors (28258328).

28661272 is a wasteful number, since it uses less digits than its factorization.

28661272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1195 (or 1191 counting only the distinct ones).

The product of its digits is 16128, while the sum is 34.

The square root of 28661272 is about 5353.6223251178. The cubic root of 28661272 is about 306.0308112566.

The spelling of 28661272 in words is "twenty-eight million, six hundred sixty-one thousand, two hundred seventy-two".