28432407 has 8 divisors (see below), whose sum is σ = 37945600. Its totient is φ = 18937080.

The previous prime is 28432403. The next prime is 28432421. The reversal of 28432407 is 70423482.

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

It is not a de Polignac number, because 28432407 - 2² = 28432403 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 (28432403) 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, 157 + ... + 7542.

It is an arithmetic number, because the mean of its divisors is an integer number (4743200).

Almost surely, 2^28432407 is an apocalyptic number.

28432407 is a deficient number, since it is larger than the sum of its proper divisors (9513193).

28432407 is a wasteful number, since it uses less digits than its factorization.

28432407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8933.

The product of its (nonzero) digits is 10752, while the sum is 30.

The square root of 28432407 is about 5332.2047034974. The cubic root of 28432407 is about 305.2140645403.

Adding to 28432407 its reverse (70423482), we get a palindrome (98855889).

The spelling of 28432407 in words is "twenty-eight million, four hundred thirty-two thousand, four hundred seven".