28039413 has 4 divisors (see below), whose sum is σ = 37385888. Its totient is φ = 18692940.

The previous prime is 28039399. The next prime is 28039439. The reversal of 28039413 is 31493082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28039413 - 2¹⁴ = 28023029 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 (28039463) 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, 4673233 + ... + 4673238.

It is an arithmetic number, because the mean of its divisors is an integer number (9346472).

Almost surely, 2^28039413 is an apocalyptic number.

It is an amenable number.

28039413 is a deficient number, since it is larger than the sum of its proper divisors (9346475).

28039413 is an equidigital number, since it uses as much as digits as its factorization.

28039413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9346474.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 28039413 is about 5295.2254909494. The cubic root of 28039413 is about 303.8013078666.

It can be divided in two parts, 280 and 39413, that added together give a palindrome (39693).

The spelling of 28039413 in words is "twenty-eight million, thirty-nine thousand, four hundred thirteen".