28851513 has 4 divisors (see below), whose sum is σ = 38468688. Its totient is φ = 19234340.

The previous prime is 28851503. The next prime is 28851521. The reversal of 28851513 is 31515882.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28851513 - 2⁴ = 28851497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28851503) 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, 4808583 + ... + 4808588.

It is an arithmetic number, because the mean of its divisors is an integer number (9617172).

Almost surely, 2^28851513 is an apocalyptic number.

It is an amenable number.

28851513 is a deficient number, since it is larger than the sum of its proper divisors (9617175).

28851513 is an equidigital number, since it uses as much as digits as its factorization.

28851513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9617174.

The product of its digits is 9600, while the sum is 33.

The square root of 28851513 is about 5371.3604421971. The cubic root of 28851513 is about 306.7064182612.

The spelling of 28851513 in words is "twenty-eight million, eight hundred fifty-one thousand, five hundred thirteen".