28131473 has 2 divisors, whose sum is σ = 28131474. Its totient is φ = 28131472.

The previous prime is 28131449. The next prime is 28131527. The reversal of 28131473 is 37413182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26708224 + 1423249 = 5168^2 + 1193^2 .

It is a cyclic number.

It is not a de Polignac number, because 28131473 - 2⁶ = 28131409 is a prime.

It is not a weakly prime, because it can be changed into another prime (28131373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14065736 + 14065737.

It is an arithmetic number, because the mean of its divisors is an integer number (14065737).

Almost surely, 2^28131473 is an apocalyptic number.

It is an amenable number.

28131473 is a deficient number, since it is larger than the sum of its proper divisors (1).

28131473 is an equidigital number, since it uses as much as digits as its factorization.

28131473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 29.

The square root of 28131473 is about 5303.9111040816. The cubic root of 28131473 is about 304.1334284148.

The spelling of 28131473 in words is "twenty-eight million, one hundred thirty-one thousand, four hundred seventy-three".