28360691 has 4 divisors (see below), whose sum is σ = 29275584. Its totient is φ = 27445800.

The previous prime is 28360687. The next prime is 28360697. The reversal of 28360691 is 19606382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19606382 = 2 ⋅9803191.

It is a cyclic number.

It is not a de Polignac number, because 28360691 - 2² = 28360687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28360697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 457400 + ... + 457461.

It is an arithmetic number, because the mean of its divisors is an integer number (7318896).

Almost surely, 2^28360691 is an apocalyptic number.

28360691 is a deficient number, since it is larger than the sum of its proper divisors (914893).

28360691 is an equidigital number, since it uses as much as digits as its factorization.

28360691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914892.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 28360691 is about 5325.4756595069. The cubic root of 28360691 is about 304.9572313048.

The spelling of 28360691 in words is "twenty-eight million, three hundred sixty thousand, six hundred ninety-one".