28424507 has 4 divisors (see below), whose sum is σ = 28435680. Its totient is φ = 28413336.

The previous prime is 28424503. The next prime is 28424533. The reversal of 28424507 is 70542482.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28424507 - 2² = 28424503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28424503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 293 + ... + 7545.

It is an arithmetic number, because the mean of its divisors is an integer number (7108920).

Almost surely, 2^28424507 is an apocalyptic number.

28424507 is a deficient number, since it is larger than the sum of its proper divisors (11173).

28424507 is an equidigital number, since it uses as much as digits as its factorization.

28424507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11172.

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 28424507 is about 5331.4638702705. The cubic root of 28424507 is about 305.1857938131.

Adding to 28424507 its reverse (70542482), we get a palindrome (98966989).

The spelling of 28424507 in words is "twenty-eight million, four hundred twenty-four thousand, five hundred seven".