28780413 has 16 divisors (see below), whose sum is σ = 39606336. Its totient is φ = 18576000.

The previous prime is 28780397. The next prime is 28780417. The reversal of 28780413 is 31408782.

It is not a de Polignac number, because 28780413 - 2⁴ = 28780397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28780417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27345 + ... + 28377.

It is an arithmetic number, because the mean of its divisors is an integer number (2475396).

Almost surely, 2^28780413 is an apocalyptic number.

It is an amenable number.

28780413 is a deficient number, since it is larger than the sum of its proper divisors (10825923).

28780413 is a wasteful number, since it uses less digits than its factorization.

28780413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 28780413 is about 5364.7379246334. The cubic root of 28780413 is about 306.4542678331.

The spelling of 28780413 in words is "twenty-eight million, seven hundred eighty thousand, four hundred thirteen".