28318039 has 4 divisors (see below), whose sum is σ = 29983824. Its totient is φ = 26652256.

The previous prime is 28318027. The next prime is 28318051. The reversal of 28318039 is 93081382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93081382 = 2 ⋅46540691.

It is an interprime number because it is at equal distance from previous prime (28318027) and next prime (28318051).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28318039 is a prime.

It is a super-2 number, since 2×28318039² = 1603822665611042, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28317995 and 28318013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28318009) 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, 832867 + ... + 832900.

It is an arithmetic number, because the mean of its divisors is an integer number (7495956).

Almost surely, 2^28318039 is an apocalyptic number.

28318039 is a deficient number, since it is larger than the sum of its proper divisors (1665785).

28318039 is a wasteful number, since it uses less digits than its factorization.

28318039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1665784.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 28318039 is about 5321.4696278378. The cubic root of 28318039 is about 304.8042782642.

The spelling of 28318039 in words is "twenty-eight million, three hundred eighteen thousand, thirty-nine".