28971111 has 32 divisors (see below), whose sum is σ = 45275328. Its totient is φ = 16312320.

The previous prime is 28971101. The next prime is 28971127. The reversal of 28971111 is 11117982.

It is not a de Polignac number, because 28971111 - 2¹³ = 28962919 is a prime.

It is a super-4 number, since 4×28971111⁴ (a number of 31 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28971101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23941 + ... + 25121.

It is an arithmetic number, because the mean of its divisors is an integer number (1414854).

Almost surely, 2^28971111 is an apocalyptic number.

28971111 is a deficient number, since it is larger than the sum of its proper divisors (16304217).

28971111 is a wasteful number, since it uses less digits than its factorization.

28971111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251.

The product of its digits is 1008, while the sum is 30.

The square root of 28971111 is about 5382.4818624869. The cubic root of 28971111 is about 307.1296300982.

The spelling of 28971111 in words is "twenty-eight million, nine hundred seventy-one thousand, one hundred eleven".