28691275 has 12 divisors (see below), whose sum is σ = 36725824. Its totient is φ = 22212000.

The previous prime is 28691261. The next prime is 28691297. The reversal of 28691275 is 57219682.

It is not a de Polignac number, because 28691275 - 2⁹ = 28690763 is a prime.

It is a super-2 number, since 2×28691275² = 1646378522251250, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17736 + ... + 19285.

Almost surely, 2^28691275 is an apocalyptic number.

28691275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28691275 is a deficient number, since it is larger than the sum of its proper divisors (8034549).

28691275 is a wasteful number, since it uses less digits than its factorization.

28691275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37062 (or 37057 counting only the distinct ones).

The product of its digits is 60480, while the sum is 40.

The square root of 28691275 is about 5356.4237136358. The cubic root of 28691275 is about 306.1375597220.

The spelling of 28691275 in words is "twenty-eight million, six hundred ninety-one thousand, two hundred seventy-five".