28261413 has 32 divisors (see below), whose sum is σ = 43228800. Its totient is φ = 18240768.

The previous prime is 28261403. The next prime is 28261421. The reversal of 28261413 is 31416282.

It is not a de Polignac number, because 28261413 - 2⁴ = 28261397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28261403) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 179931 + ... + 180087.

It is an arithmetic number, because the mean of its divisors is an integer number (1350900).

Almost surely, 2^28261413 is an apocalyptic number.

It is an amenable number.

28261413 is a deficient number, since it is larger than the sum of its proper divisors (14967387).

28261413 is a wasteful number, since it uses less digits than its factorization.

28261413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338 (or 332 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 28261413 is about 5316.1464426782. The cubic root of 28261413 is about 304.6009759996.

Adding to 28261413 its reverse (31416282), we get a palindrome (59677695).

The spelling of 28261413 in words is "twenty-eight million, two hundred sixty-one thousand, four hundred thirteen".