28531413 has 8 divisors (see below), whose sum is σ = 42268800. Its totient is φ = 19020924.

The previous prime is 28531387. The next prime is 28531417. The reversal of 28531413 is 31413582.

It is a happy number.

It is not a de Polignac number, because 28531413 - 2²⁰ = 27482837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1056719 = 28531413 / (2 + 8 + 5 + 3 + 1 + 4 + 1 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28531417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 528333 + ... + 528386.

It is an arithmetic number, because the mean of its divisors is an integer number (5283600).

Almost surely, 2^28531413 is an apocalyptic number.

It is an amenable number.

28531413 is a deficient number, since it is larger than the sum of its proper divisors (13737387).

28531413 is a wasteful number, since it uses less digits than its factorization.

28531413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056728 (or 1056722 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 28531413 is about 5341.4804127695. The cubic root of 28531413 is about 305.5679215173.

Adding to 28531413 its reverse (31413582), we get a palindrome (59944995).

It can be divided in two parts, 28 and 531413, that added together give a 12-th power (531441 = 3¹²).

The spelling of 28531413 in words is "twenty-eight million, five hundred thirty-one thousand, four hundred thirteen".