28150531 has 4 divisors (see below), whose sum is σ = 28161232. Its totient is φ = 28139832.

The previous prime is 28150517. The next prime is 28150541. The reversal of 28150531 is 13505182.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28150531 - 2⁹ = 28150019 is a prime.

It is a super-2 number, since 2×28150531² = 1584904791163922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28150496 and 28150505.

It is not an unprimeable number, because it can be changed into a prime (28150541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1645 + ... + 7681.

It is an arithmetic number, because the mean of its divisors is an integer number (7040308).

Almost surely, 2^28150531 is an apocalyptic number.

28150531 is a deficient number, since it is larger than the sum of its proper divisors (10701).

28150531 is an equidigital number, since it uses as much as digits as its factorization.

28150531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10700.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 28150531 is about 5305.7073986416. The cubic root of 28150531 is about 304.2020925107.

The spelling of 28150531 in words is "twenty-eight million, one hundred fifty thousand, five hundred thirty-one".