28012371 has 4 divisors (see below), whose sum is σ = 37349832. Its totient is φ = 18674912.

The previous prime is 28012357. The next prime is 28012381. The reversal of 28012371 is 17321082.

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

It is a cyclic number.

It is not a de Polignac number, because 28012371 - 2¹⁸ = 27750227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28012301) 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, 4668726 + ... + 4668731.

It is an arithmetic number, because the mean of its divisors is an integer number (9337458).

Almost surely, 2^28012371 is an apocalyptic number.

28012371 is a deficient number, since it is larger than the sum of its proper divisors (9337461).

28012371 is an equidigital number, since it uses as much as digits as its factorization.

28012371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9337460.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 28012371 is about 5292.6714426648. The cubic root of 28012371 is about 303.7036116055.

The spelling of 28012371 in words is "twenty-eight million, twelve thousand, three hundred seventy-one".