28432749 has 8 divisors (see below), whose sum is σ = 38553120. Its totient is φ = 18633776.

The previous prime is 28432739. The next prime is 28432753. The reversal of 28432749 is 94723482.

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 28432749 - 2¹⁷ = 28301677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28432739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80142 + ... + 80495.

It is an arithmetic number, because the mean of its divisors is an integer number (4819140).

Almost surely, 2^28432749 is an apocalyptic number.

It is an amenable number.

28432749 is a deficient number, since it is larger than the sum of its proper divisors (10120371).

28432749 is a wasteful number, since it uses less digits than its factorization.

28432749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160699.

The product of its digits is 96768, while the sum is 39.

The square root of 28432749 is about 5332.2367726874. The cubic root of 28432749 is about 305.2152882940.

It can be divided in two parts, 284 and 32749, that added together give a palindrome (33033).

The spelling of 28432749 in words is "twenty-eight million, four hundred thirty-two thousand, seven hundred forty-nine".