28080691 has 8 divisors (see below), whose sum is σ = 28623200. Its totient is φ = 27542592.

The previous prime is 28080683. The next prime is 28080697. The reversal of 28080691 is 19608082.

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

It is a cyclic number.

It is not a de Polignac number, because 28080691 - 2³ = 28080683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28080697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13561 + ... + 15493.

It is an arithmetic number, because the mean of its divisors is an integer number (3577900).

Almost surely, 2^28080691 is an apocalyptic number.

28080691 is a deficient number, since it is larger than the sum of its proper divisors (542509).

28080691 is a wasteful number, since it uses less digits than its factorization.

28080691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2205.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 28080691 is about 5299.1217196815. The cubic root of 28080691 is about 303.9503143348.

The spelling of 28080691 in words is "twenty-eight million, eighty thousand, six hundred ninety-one".