28431871 has 16 divisors (see below), whose sum is σ = 32707584. Its totient is φ = 24482304.

The previous prime is 28431869. The next prime is 28431881. The reversal of 28431871 is 17813482.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28431871 - 2¹ = 28431869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28431881) 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, 27561 + ... + 28573.

It is an arithmetic number, because the mean of its divisors is an integer number (2044224).

Almost surely, 2^28431871 is an apocalyptic number.

28431871 is a deficient number, since it is larger than the sum of its proper divisors (4275713).

28431871 is a wasteful number, since it uses less digits than its factorization.

28431871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170.

The product of its digits is 10752, while the sum is 34.

The square root of 28431871 is about 5332.1544426245. The cubic root of 28431871 is about 305.2121465907.

The spelling of 28431871 in words is "twenty-eight million, four hundred thirty-one thousand, eight hundred seventy-one".