28540371 has 4 divisors (see below), whose sum is σ = 38053832. Its totient is φ = 19026912.

The previous prime is 28540361. The next prime is 28540411. The reversal of 28540371 is 17304582.

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

It is not a de Polignac number, because 28540371 - 2⁵ = 28540339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28540301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4756726 + ... + 4756731.

It is an arithmetic number, because the mean of its divisors is an integer number (9513458).

Almost surely, 2^28540371 is an apocalyptic number.

28540371 is a deficient number, since it is larger than the sum of its proper divisors (9513461).

28540371 is an equidigital number, since it uses as much as digits as its factorization.

28540371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9513460.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 28540371 is about 5342.3188785395. The cubic root of 28540371 is about 305.5998978635.

The spelling of 28540371 in words is "twenty-eight million, five hundred forty thousand, three hundred seventy-one".