28381959 has 24 divisors (see below), whose sum is σ = 43853472. Its totient is φ = 17625600.

The previous prime is 28381939. The next prime is 28381973. The reversal of 28381959 is 95918382.

It is a happy number.

It is not a de Polignac number, because 28381959 - 2⁷ = 28381831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28381919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14859 + ... + 16659.

It is an arithmetic number, because the mean of its divisors is an integer number (1827228).

Almost surely, 2^28381959 is an apocalyptic number.

28381959 is a deficient number, since it is larger than the sum of its proper divisors (15471513).

28381959 is a wasteful number, since it uses less digits than its factorization.

28381959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1927 (or 1924 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 28381959 is about 5327.4721022263. The cubic root of 28381959 is about 305.0334425392.

The spelling of 28381959 in words is "twenty-eight million, three hundred eighty-one thousand, nine hundred fifty-nine".