28005697 has 8 divisors (see below), whose sum is σ = 29494080. Its totient is φ = 26539920.

The previous prime is 28005683. The next prime is 28005701. The reversal of 28005697 is 79650082.

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 28005697 - 2⁷ = 28005569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28005667) 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, 3079 + ... + 8092.

It is an arithmetic number, because the mean of its divisors is an integer number (3686760).

Almost surely, 2^28005697 is an apocalyptic number.

It is an amenable number.

28005697 is a deficient number, since it is larger than the sum of its proper divisors (1488383).

28005697 is a wasteful number, since it uses less digits than its factorization.

28005697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11303.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 28005697 is about 5292.0409106506. The cubic root of 28005697 is about 303.6794903712.

The spelling of 28005697 in words is "twenty-eight million, five thousand, six hundred ninety-seven".