28992871 has 4 divisors (see below), whose sum is σ = 30698352. Its totient is φ = 27287392.

The previous prime is 28992869. The next prime is 28992881. The reversal of 28992871 is 17829982.

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 28992871 - 2¹ = 28992869 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 (28992881) 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, 852715 + ... + 852748.

It is an arithmetic number, because the mean of its divisors is an integer number (7674588).

Almost surely, 2^28992871 is an apocalyptic number.

28992871 is a deficient number, since it is larger than the sum of its proper divisors (1705481).

28992871 is a wasteful number, since it uses less digits than its factorization.

28992871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1705480.

The product of its digits is 145152, while the sum is 46.

The square root of 28992871 is about 5384.5028554176. The cubic root of 28992871 is about 307.2065051644.

The spelling of 28992871 in words is "twenty-eight million, nine hundred ninety-two thousand, eight hundred seventy-one".