28971291 has 16 divisors (see below), whose sum is σ = 39384576. Its totient is φ = 18939456.

The previous prime is 28971287. The next prime is 28971307. The reversal of 28971291 is 19217982.

It is not a de Polignac number, because 28971291 - 2² = 28971287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28971211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57346 + ... + 57848.

It is an arithmetic number, because the mean of its divisors is an integer number (2461536).

Almost surely, 2^28971291 is an apocalyptic number.

28971291 is a deficient number, since it is larger than the sum of its proper divisors (10413285).

28971291 is a wasteful number, since it uses less digits than its factorization.

28971291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842.

The product of its digits is 18144, while the sum is 39.

The square root of 28971291 is about 5382.4985833719. The cubic root of 28971291 is about 307.1302661711.

The spelling of 28971291 in words is "twenty-eight million, nine hundred seventy-one thousand, two hundred ninety-one".