28137895 has 4 divisors (see below), whose sum is σ = 33765480. Its totient is φ = 22510312.

The previous prime is 28137877. The next prime is 28137919. The reversal of 28137895 is 59873182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 59873182 = 2 ⋅29936591.

It is a cyclic number.

It is not a de Polignac number, because 28137895 - 2¹¹ = 28135847 is a prime.

It is a super-2 number, since 2×28137895² = 1583482270062050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2813785 + ... + 2813794.

It is an arithmetic number, because the mean of its divisors is an integer number (8441370).

Almost surely, 2^28137895 is an apocalyptic number.

28137895 is a deficient number, since it is larger than the sum of its proper divisors (5627585).

28137895 is an equidigital number, since it uses as much as digits as its factorization.

28137895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5627584.

The product of its digits is 120960, while the sum is 43.

The square root of 28137895 is about 5304.5164718379. The cubic root of 28137895 is about 304.1565697113.

The spelling of 28137895 in words is "twenty-eight million, one hundred thirty-seven thousand, eight hundred ninety-five".