28137885 has 8 divisors (see below), whose sum is σ = 45020640. Its totient is φ = 15006864.

The previous prime is 28137877. The next prime is 28137919. The reversal of 28137885 is 58873182.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28137885 - 2³ = 28137877 is a prime.

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, 937915 + ... + 937944.

It is an arithmetic number, because the mean of its divisors is an integer number (5627580).

Almost surely, 2^28137885 is an apocalyptic number.

It is an amenable number.

28137885 is a deficient number, since it is larger than the sum of its proper divisors (16882755).

28137885 is a wasteful number, since it uses less digits than its factorization.

28137885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1875867.

The product of its digits is 107520, while the sum is 42.

The square root of 28137885 is about 5304.5155292449. The cubic root of 28137885 is about 304.1565336797.

The spelling of 28137885 in words is "twenty-eight million, one hundred thirty-seven thousand, eight hundred eighty-five".