28911071 has 4 divisors (see below), whose sum is σ = 33041232. Its totient is φ = 24780912.

The previous prime is 28911059. The next prime is 28911073. The reversal of 28911071 is 17011982.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28911071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28911073) 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, 2065070 + ... + 2065083.

It is an arithmetic number, because the mean of its divisors is an integer number (8260308).

Almost surely, 2^28911071 is an apocalyptic number.

28911071 is a deficient number, since it is larger than the sum of its proper divisors (4130161).

28911071 is an equidigital number, since it uses as much as digits as its factorization.

28911071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4130160.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 28911071 is about 5376.9016171025. The cubic root of 28911071 is about 306.9173172632.

The spelling of 28911071 in words is "twenty-eight million, nine hundred eleven thousand, seventy-one".