28432531 has 8 divisors (see below), whose sum is σ = 31230720. Its totient is φ = 25764552.

The previous prime is 28432529. The next prime is 28432559. The reversal of 28432531 is 13523482.

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 28432531 - 2¹ = 28432529 is a prime.

It is a super-2 number, since 2×28432531² = 1616817638131922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28432531.

It is not an unprimeable number, because it can be changed into a prime (28432501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32095 + ... + 32968.

It is an arithmetic number, because the mean of its divisors is an integer number (3903840).

Almost surely, 2^28432531 is an apocalyptic number.

28432531 is a deficient number, since it is larger than the sum of its proper divisors (2798189).

28432531 is a wasteful number, since it uses less digits than its factorization.

28432531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65105.

The product of its digits is 5760, while the sum is 28.

The square root of 28432531 is about 5332.2163309453. The cubic root of 28432531 is about 305.2145082416.

The spelling of 28432531 in words is "twenty-eight million, four hundred thirty-two thousand, five hundred thirty-one".