28971235 has 8 divisors (see below), whose sum is σ = 34825536. Its totient is φ = 23136960.

The previous prime is 28971227. The next prime is 28971251. The reversal of 28971235 is 53217982.

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

It is not a de Polignac number, because 28971235 - 2³ = 28971227 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28971194 and 28971203.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1611 + ... + 7780.

It is an arithmetic number, because the mean of its divisors is an integer number (4353192).

Almost surely, 2^28971235 is an apocalyptic number.

28971235 is a deficient number, since it is larger than the sum of its proper divisors (5854301).

28971235 is an equidigital number, since it uses as much as digits as its factorization.

28971235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10013.

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

The square root of 28971235 is about 5382.4933813243. The cubic root of 28971235 is about 307.1300682820.

The spelling of 28971235 in words is "twenty-eight million, nine hundred seventy-one thousand, two hundred thirty-five".