28727513 has 4 divisors (see below), whose sum is σ = 29214480. Its totient is φ = 28240548.

The previous prime is 28727459. The next prime is 28727519. The reversal of 28727513 is 31572782.

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 28727513 - 2²² = 24533209 is a prime.

It is a super-3 number, since 3×28727513³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28727519) 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, 243395 + ... + 243512.

It is an arithmetic number, because the mean of its divisors is an integer number (7303620).

Almost surely, 2^28727513 is an apocalyptic number.

It is an amenable number.

28727513 is a deficient number, since it is larger than the sum of its proper divisors (486967).

28727513 is an equidigital number, since it uses as much as digits as its factorization.

28727513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486966.

The product of its digits is 23520, while the sum is 35.

The square root of 28727513 is about 5359.8053136285. The cubic root of 28727513 is about 306.2663926808.

The spelling of 28727513 in words is "twenty-eight million, seven hundred twenty-seven thousand, five hundred thirteen".