28671913 has 4 divisors (see below), whose sum is σ = 29099920. Its totient is φ = 28243908.

The previous prime is 28671899. The next prime is 28671917. The reversal of 28671913 is 31917682.

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 28671913 - 2²¹ = 26574761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28671917) 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 3 ways as a sum of consecutive naturals, for example, 213903 + ... + 214036.

It is an arithmetic number, because the mean of its divisors is an integer number (7274980).

Almost surely, 2^28671913 is an apocalyptic number.

It is an amenable number.

28671913 is a deficient number, since it is larger than the sum of its proper divisors (428007).

28671913 is an equidigital number, since it uses as much as digits as its factorization.

28671913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428006.

The product of its digits is 18144, while the sum is 37.

The square root of 28671913 is about 5354.6160459925. The cubic root of 28671913 is about 306.0686796729.

It can be divided in two parts, 28671 and 913, that added together give a square (29584 = 172²).

The spelling of 28671913 in words is "twenty-eight million, six hundred seventy-one thousand, nine hundred thirteen".