28261339 has 4 divisors (see below), whose sum is σ = 28272024. Its totient is φ = 28250656.

The previous prime is 28261307. The next prime is 28261391. The reversal of 28261339 is 93316282.

It is a happy number.

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: 93316282 = 2 ⋅46658141.

It is a cyclic number.

It is not a de Polignac number, because 28261339 - 2⁵ = 28261307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28261039) 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, 1884 + ... + 7750.

It is an arithmetic number, because the mean of its divisors is an integer number (7068006).

Almost surely, 2^28261339 is an apocalyptic number.

28261339 is a deficient number, since it is larger than the sum of its proper divisors (10685).

28261339 is an equidigital number, since it uses as much as digits as its factorization.

28261339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10684.

The product of its digits is 15552, while the sum is 34.

The square root of 28261339 is about 5316.1394827450. The cubic root of 28261339 is about 304.6007101425.

The spelling of 28261339 in words is "twenty-eight million, two hundred sixty-one thousand, three hundred thirty-nine".