28102975 has 6 divisors (see below), whose sum is σ = 34847720. Its totient is φ = 22482360.

The previous prime is 28102973. The next prime is 28103003. The reversal of 28102975 is 57920182.

It is not a de Polignac number, because 28102975 - 2¹ = 28102973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28102975.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28102973) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 562035 + ... + 562084.

Almost surely, 2^28102975 is an apocalyptic number.

28102975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28102975 is a deficient number, since it is larger than the sum of its proper divisors (6744745).

28102975 is a wasteful number, since it uses less digits than its factorization.

28102975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1124129 (or 1124124 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 28102975 is about 5301.2239152860. The cubic root of 28102975 is about 304.0306950481.

The spelling of 28102975 in words is "twenty-eight million, one hundred two thousand, nine hundred seventy-five".