28363971 has 4 divisors (see below), whose sum is σ = 37818632. Its totient is φ = 18909312.

The previous prime is 28363919. The next prime is 28363987. The reversal of 28363971 is 17936382.

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

It is not a de Polignac number, because 28363971 - 2⁹ = 28363459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28363901) 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, 4727326 + ... + 4727331.

It is an arithmetic number, because the mean of its divisors is an integer number (9454658).

Almost surely, 2^28363971 is an apocalyptic number.

28363971 is a deficient number, since it is larger than the sum of its proper divisors (9454661).

28363971 is an equidigital number, since it uses as much as digits as its factorization.

28363971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9454660.

The product of its digits is 54432, while the sum is 39.

The square root of 28363971 is about 5325.7836043159. The cubic root of 28363971 is about 304.9689872615.

The spelling of 28363971 in words is "twenty-eight million, three hundred sixty-three thousand, nine hundred seventy-one".