28124971 has 16 divisors (see below), whose sum is σ = 33062400. Its totient is φ = 23913960.

The previous prime is 28124969. The next prime is 28124981. The reversal of 28124971 is 17942182.

It is not a de Polignac number, because 28124971 - 2¹ = 28124969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28124981) 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, 57036 + ... + 57526.

It is an arithmetic number, because the mean of its divisors is an integer number (2066400).

Almost surely, 2^28124971 is an apocalyptic number.

28124971 is a deficient number, since it is larger than the sum of its proper divisors (4937429).

28124971 is an equidigital number, since it uses as much as digits as its factorization.

28124971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679 (or 665 counting only the distinct ones).

The product of its digits is 8064, while the sum is 34.

The square root of 28124971 is about 5303.2981247522. The cubic root of 28124971 is about 304.1099952549.

It can be divided in two parts, 281 and 24971, that added together give a palindrome (25252).

The spelling of 28124971 in words is "twenty-eight million, one hundred twenty-four thousand, nine hundred seventy-one".