28180439 has 12 divisors (see below), whose sum is σ = 34507800. Its totient is φ = 22882608.

The previous prime is 28180393. The next prime is 28180459. The reversal of 28180439 is 93408182.

It is a happy number.

It is not a de Polignac number, because 28180439 - 2⁸ = 28180183 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28180399 and 28180408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28180459) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14204 + ... + 16065.

It is an arithmetic number, because the mean of its divisors is an integer number (2875650).

Almost surely, 2^28180439 is an apocalyptic number.

28180439 is a deficient number, since it is larger than the sum of its proper divisors (6327361).

28180439 is a wasteful number, since it uses less digits than its factorization.

28180439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30302 (or 30295 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 28180439 is about 5308.5251247404. The cubic root of 28180439 is about 304.3097856368.

The spelling of 28180439 in words is "twenty-eight million, one hundred eighty thousand, four hundred thirty-nine".