28395691 has 4 divisors (see below), whose sum is σ = 28612584. Its totient is φ = 28178800.

The previous prime is 28395677. The next prime is 28395713. The reversal of 28395691 is 19659382.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19659382 = 2 ⋅9829691.

It is a cyclic number.

It is not a de Polignac number, because 28395691 - 2¹⁷ = 28264619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28395791) 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, 108250 + ... + 108511.

It is an arithmetic number, because the mean of its divisors is an integer number (7153146).

Almost surely, 2^28395691 is an apocalyptic number.

28395691 is a deficient number, since it is larger than the sum of its proper divisors (216893).

28395691 is a wasteful number, since it uses less digits than its factorization.

28395691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216892.

The product of its digits is 116640, while the sum is 43.

The square root of 28395691 is about 5328.7607377326. The cubic root of 28395691 is about 305.0826292294.

The spelling of 28395691 in words is "twenty-eight million, three hundred ninety-five thousand, six hundred ninety-one".