28452131 has 4 divisors (see below), whose sum is σ = 28481232. Its totient is φ = 28423032.

The previous prime is 28452113. The next prime is 28452133. The reversal of 28452131 is 13125482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13125482 = 2 ⋅6562741.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28452131 is a prime.

It is a super-2 number, since 2×28452131² = 1619047516882322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28452131.

It is not an unprimeable number, because it can be changed into a prime (28452133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13031 + ... + 15056.

It is an arithmetic number, because the mean of its divisors is an integer number (7120308).

Almost surely, 2^28452131 is an apocalyptic number.

28452131 is a deficient number, since it is larger than the sum of its proper divisors (29101).

28452131 is a wasteful number, since it uses less digits than its factorization.

28452131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29100.

The product of its digits is 1920, while the sum is 26.

The square root of 28452131 is about 5334.0538992402. The cubic root of 28452131 is about 305.2846254637.

The spelling of 28452131 in words is "twenty-eight million, four hundred fifty-two thousand, one hundred thirty-one".