28861313 has 6 divisors (see below), whose sum is σ = 31252374. Its totient is φ = 26641056.

The previous prime is 28861303. The next prime is 28861319. The reversal of 28861313 is 31316882.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1056784 + 27804529 = 1028^2 + 5273^2 .

It is not a de Polignac number, because 28861313 - 2⁶ = 28861249 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28861313.

It is not an unprimeable number, because it can be changed into a prime (28861319) 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 5 ways as a sum of consecutive naturals, for example, 85220 + ... + 85557.

It is an arithmetic number, because the mean of its divisors is an integer number (5208729).

Almost surely, 2^28861313 is an apocalyptic number.

It is an amenable number.

28861313 is a deficient number, since it is larger than the sum of its proper divisors (2391061).

28861313 is a wasteful number, since it uses less digits than its factorization.

28861313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170803 (or 170790 counting only the distinct ones).

The product of its digits is 6912, while the sum is 32.

The square root of 28861313 is about 5372.2726103577. The cubic root of 28861313 is about 306.7411406764.

It can be divided in two parts, 288613 and 13, that multiplied together give a square (3751969 = 1937²).

The spelling of 28861313 in words is "twenty-eight million, eight hundred sixty-one thousand, three hundred thirteen".