28134791 has 4 divisors (see below), whose sum is σ = 28192584. Its totient is φ = 28077000.

The previous prime is 28134787. The next prime is 28134793. The reversal of 28134791 is 19743182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19743182 = 2 ⋅9871591.

It is a cyclic number.

It is not a de Polignac number, because 28134791 - 2² = 28134787 is a prime.

It is a super-2 number, since 2×28134791² = 1583132929227362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28134793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28160 + ... + 29141.

It is an arithmetic number, because the mean of its divisors is an integer number (7048146).

Almost surely, 2^28134791 is an apocalyptic number.

28134791 is a deficient number, since it is larger than the sum of its proper divisors (57793).

28134791 is an equidigital number, since it uses as much as digits as its factorization.

28134791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57792.

The product of its digits is 12096, while the sum is 35.

The square root of 28134791 is about 5304.2238829069. The cubic root of 28134791 is about 304.1453850709.

The spelling of 28134791 in words is "twenty-eight million, one hundred thirty-four thousand, seven hundred ninety-one".