28381529 has 8 divisors (see below), whose sum is σ = 31247040. Its totient is φ = 25563600.

The previous prime is 28381519. The next prime is 28381541. The reversal of 28381529 is 92518382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28381529 - 2²⁰ = 27332953 is a prime.

It is a super-2 number, since 2×28381529² = 1611022376755682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28381492 and 28381501.

It is not an unprimeable number, because it can be changed into a prime (28381519) 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 7 ways as a sum of consecutive naturals, for example, 10637 + ... + 13034.

It is an arithmetic number, because the mean of its divisors is an integer number (3905880).

Almost surely, 2^28381529 is an apocalyptic number.

It is an amenable number.

28381529 is a deficient number, since it is larger than the sum of its proper divisors (2865511).

28381529 is a wasteful number, since it uses less digits than its factorization.

28381529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23791.

The product of its digits is 34560, while the sum is 38.

The square root of 28381529 is about 5327.4317452221. The cubic root of 28381529 is about 305.0319020648.

The spelling of 28381529 in words is "twenty-eight million, three hundred eighty-one thousand, five hundred twenty-nine".