28323507 has 8 divisors (see below), whose sum is σ = 37825984. Its totient is φ = 18851688.

The previous prime is 28323499. The next prime is 28323539. The reversal of 28323507 is 70532382.

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

It is not a de Polignac number, because 28323507 - 2³ = 28323499 is a prime.

It is a super-4 number, since 4×28323507⁴ (a number of 31 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28323577) 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, 5413 + ... + 9270.

It is an arithmetic number, because the mean of its divisors is an integer number (4728248).

Almost surely, 2^28323507 is an apocalyptic number.

28323507 is a deficient number, since it is larger than the sum of its proper divisors (9502477).

28323507 is a wasteful number, since it uses less digits than its factorization.

28323507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15329.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 28323507 is about 5321.9833708872. The cubic root of 28323507 is about 304.8238954716.

Adding to 28323507 its reverse (70532382), we get a palindrome (98855889).

The spelling of 28323507 in words is "twenty-eight million, three hundred twenty-three thousand, five hundred seven".