28713387 has 4 divisors (see below), whose sum is σ = 38284520. Its totient is φ = 19142256.

The previous prime is 28713383. The next prime is 28713397. The reversal of 28713387 is 78331782.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28713387 - 2² = 28713383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28713383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4785562 + ... + 4785567.

It is an arithmetic number, because the mean of its divisors is an integer number (9571130).

Almost surely, 2^28713387 is an apocalyptic number.

28713387 is a deficient number, since it is larger than the sum of its proper divisors (9571133).

28713387 is an equidigital number, since it uses as much as digits as its factorization.

28713387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9571132.

The product of its digits is 56448, while the sum is 39.

The square root of 28713387 is about 5358.4873798489. The cubic root of 28713387 is about 306.2161849656.

It can be divided in two parts, 28 and 713387, that added together give a triangular number (713415 = T₁₁₉₄).

The spelling of 28713387 in words is "twenty-eight million, seven hundred thirteen thousand, three hundred eighty-seven".