28424091 has 4 divisors (see below), whose sum is σ = 37898792. Its totient is φ = 18949392.

The previous prime is 28424041. The next prime is 28424107. The reversal of 28424091 is 19042482.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28424091 - 2¹³ = 28415899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28424041) 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, 4737346 + ... + 4737351.

It is an arithmetic number, because the mean of its divisors is an integer number (9474698).

Almost surely, 2^28424091 is an apocalyptic number.

28424091 is a deficient number, since it is larger than the sum of its proper divisors (9474701).

28424091 is an equidigital number, since it uses as much as digits as its factorization.

28424091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9474700.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 28424091 is about 5331.4248564525. The cubic root of 28424091 is about 305.1843049815.

The spelling of 28424091 in words is "twenty-eight million, four hundred twenty-four thousand, ninety-one".