28247413 has 4 divisors (see below), whose sum is σ = 28327788. Its totient is φ = 28167040.

The previous prime is 28247407. The next prime is 28247447. The reversal of 28247413 is 31474282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4656964 + 23590449 = 2158^2 + 4857^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28247413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28241413) 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, 39658 + ... + 40363.

It is an arithmetic number, because the mean of its divisors is an integer number (7081947).

Almost surely, 2^28247413 is an apocalyptic number.

It is an amenable number.

28247413 is a deficient number, since it is larger than the sum of its proper divisors (80375).

28247413 is an equidigital number, since it uses as much as digits as its factorization.

28247413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80374.

The product of its digits is 10752, while the sum is 31.

The square root of 28247413 is about 5314.8295363069. The cubic root of 28247413 is about 304.5506704467.

The spelling of 28247413 in words is "twenty-eight million, two hundred forty-seven thousand, four hundred thirteen".