28081513 has 8 divisors (see below), whose sum is σ = 28765440. Its totient is φ = 27401280.

The previous prime is 28081511. The next prime is 28081519. The reversal of 28081513 is 31518082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28081513 - 2¹ = 28081511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28081511) 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, 19953 + ... + 21313.

It is an arithmetic number, because the mean of its divisors is an integer number (3595680).

Almost surely, 2^28081513 is an apocalyptic number.

It is an amenable number.

28081513 is a deficient number, since it is larger than the sum of its proper divisors (683927).

28081513 is a wasteful number, since it uses less digits than its factorization.

28081513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1847.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 28081513 is about 5299.1992791364. The cubic root of 28081513 is about 303.9532801298.

Adding to 28081513 its reverse (31518082), we get a palindrome (59599595).

The spelling of 28081513 in words is "twenty-eight million, eighty-one thousand, five hundred thirteen".