28348813 has 4 divisors (see below), whose sum is σ = 28572160. Its totient is φ = 28125468.

The previous prime is 28348807. The next prime is 28348819. The reversal of 28348813 is 31884382.

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 an interprime number because it is at equal distance from previous prime (28348807) and next prime (28348819).

It is a cyclic number.

It is not a de Polignac number, because 28348813 - 2¹³ = 28340621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28348819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111483 + ... + 111736.

It is an arithmetic number, because the mean of its divisors is an integer number (7143040).

Almost surely, 2^28348813 is an apocalyptic number.

It is an amenable number.

28348813 is a deficient number, since it is larger than the sum of its proper divisors (223347).

28348813 is a wasteful number, since it uses less digits than its factorization.

28348813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223346.

The product of its digits is 36864, while the sum is 37.

The square root of 28348813 is about 5324.3603371673. The cubic root of 28348813 is about 304.9146513855.

It can be divided in two parts, 28348 and 813, that added together give a triangular number (29161 = T₂₄₁).

The spelling of 28348813 in words is "twenty-eight million, three hundred forty-eight thousand, eight hundred thirteen".