28372387 has 2 divisors, whose sum is σ = 28372388. Its totient is φ = 28372386.

The previous prime is 28372321. The next prime is 28372397. The reversal of 28372387 is 78327382.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28372387 is a prime.

It is not a weakly prime, because it can be changed into another prime (28372397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14186193 + 14186194.

It is an arithmetic number, because the mean of its divisors is an integer number (14186194).

Almost surely, 2^28372387 is an apocalyptic number.

28372387 is a deficient number, since it is larger than the sum of its proper divisors (1).

28372387 is an equidigital number, since it uses as much as digits as its factorization.

28372387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 40.

The square root of 28372387 is about 5326.5736641860. The cubic root of 28372387 is about 304.9991471803. Note that the first 3 decimals are identical.

The spelling of 28372387 in words is "twenty-eight million, three hundred seventy-two thousand, three hundred eighty-seven".