28597871 has 4 divisors (see below), whose sum is σ = 28689552. Its totient is φ = 28506192.

The previous prime is 28597867. The next prime is 28597873. The reversal of 28597871 is 17879582.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28597871 - 2² = 28597867 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28597873) 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, 45371 + ... + 45996.

It is an arithmetic number, because the mean of its divisors is an integer number (7172388).

Almost surely, 2^28597871 is an apocalyptic number.

28597871 is a deficient number, since it is larger than the sum of its proper divisors (91681).

28597871 is an equidigital number, since it uses as much as digits as its factorization.

28597871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91680.

The product of its digits is 282240, while the sum is 47.

The square root of 28597871 is about 5347.6977289297. The cubic root of 28597871 is about 305.8049898787.

The spelling of 28597871 in words is "twenty-eight million, five hundred ninety-seven thousand, eight hundred seventy-one".