13028861 has 4 divisors (see below), whose sum is σ = 13037724. Its totient is φ = 13020000.

The previous prime is 13028843. The next prime is 13028863. The reversal of 13028861 is 16882031.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16882031 = 29 ⋅582139.

It can be written as a sum of positive squares in 2 ways, for example, as 1705636 + 11323225 = 1306^2 + 3365^2 .

It is a cyclic number.

It is not a de Polignac number, because 13028861 - 2⁶ = 13028797 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 (13028863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1640 + ... + 5361.

It is an arithmetic number, because the mean of its divisors is an integer number (3259431).

Almost surely, 2^13028861 is an apocalyptic number.

It is an amenable number.

13028861 is a deficient number, since it is larger than the sum of its proper divisors (8863).

13028861 is an equidigital number, since it uses as much as digits as its factorization.

13028861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8862.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 13028861 is about 3609.5513571634. The cubic root of 13028861 is about 235.3073449586.

The spelling of 13028861 in words is "thirteen million, twenty-eight thousand, eight hundred sixty-one".