28039975 has 6 divisors (see below), whose sum is σ = 34769600. Its totient is φ = 22431960.

The previous prime is 28039961. The next prime is 28039981. The reversal of 28039975 is 57993082.

It is a happy number.

It is not a de Polignac number, because 28039975 - 2⁵ = 28039943 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 560775 + ... + 560824.

Almost surely, 2^28039975 is an apocalyptic number.

28039975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28039975 is a deficient number, since it is larger than the sum of its proper divisors (6729625).

28039975 is a wasteful number, since it uses less digits than its factorization.

28039975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121609 (or 1121604 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 28039975 is about 5295.2785573565. The cubic root of 28039975 is about 303.8033375714.

The spelling of 28039975 in words is "twenty-eight million, thirty-nine thousand, nine hundred seventy-five".