28356541 has 4 divisors (see below), whose sum is σ = 29122972. Its totient is φ = 27590112.

The previous prime is 28356529. The next prime is 28356547. The reversal of 28356541 is 14565382.

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 19175641 + 9180900 = 4379^2 + 3030^2 .

It is a cyclic number.

It is not a de Polignac number, because 28356541 - 2¹³ = 28348349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28356497 and 28356506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28356547) 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, 383160 + ... + 383233.

It is an arithmetic number, because the mean of its divisors is an integer number (7280743).

Almost surely, 2^28356541 is an apocalyptic number.

It is an amenable number.

28356541 is a deficient number, since it is larger than the sum of its proper divisors (766431).

28356541 is an equidigital number, since it uses as much as digits as its factorization.

28356541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766430.

The product of its digits is 28800, while the sum is 34.

The square root of 28356541 is about 5325.0860086951. The cubic root of 28356541 is about 304.9423558534.

The spelling of 28356541 in words is "twenty-eight million, three hundred fifty-six thousand, five hundred forty-one".