28247913 has 16 divisors (see below), whose sum is σ = 43200000. Its totient is φ = 18223920.

The previous prime is 28247903. The next prime is 28247917. The reversal of 28247913 is 31974282.

It is not a de Polignac number, because 28247913 - 2⁵ = 28247881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28247917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16038 + ... + 17711.

It is an arithmetic number, because the mean of its divisors is an integer number (2700000).

Almost surely, 2^28247913 is an apocalyptic number.

It is an amenable number.

28247913 is a deficient number, since it is larger than the sum of its proper divisors (14952087).

28247913 is a wasteful number, since it uses less digits than its factorization.

28247913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33789 (or 33783 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 28247913 is about 5314.8765742960. The cubic root of 28247913 is about 304.5524673598.

The spelling of 28247913 in words is "twenty-eight million, two hundred forty-seven thousand, nine hundred thirteen".