28131873 has 32 divisors (see below), whose sum is σ = 47081472. Its totient is φ = 14515200.

The previous prime is 28131871. The next prime is 28131881. The reversal of 28131873 is 37813182.

It is not a de Polignac number, because 28131873 - 2¹ = 28131871 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (28131871) 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, 44268 + ... + 44898.

It is an arithmetic number, because the mean of its divisors is an integer number (1471296).

Almost surely, 2^28131873 is an apocalyptic number.

It is an amenable number.

28131873 is a deficient number, since it is larger than the sum of its proper divisors (18949599).

28131873 is a wasteful number, since it uses less digits than its factorization.

28131873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845.

The product of its digits is 8064, while the sum is 33.

The square root of 28131873 is about 5303.9488119702. The cubic root of 28131873 is about 304.1348698940.

The spelling of 28131873 in words is "twenty-eight million, one hundred thirty-one thousand, eight hundred seventy-three".