28372313 has 2 divisors, whose sum is σ = 28372314. Its totient is φ = 28372312.

The previous prime is 28372291. The next prime is 28372321. The reversal of 28372313 is 31327382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25725184 + 2647129 = 5072^2 + 1627^2 .

It is a cyclic number.

It is not a de Polignac number, because 28372313 - 2⁶ = 28372249 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28378313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14186156 + 14186157.

It is an arithmetic number, because the mean of its divisors is an integer number (14186157).

Almost surely, 2^28372313 is an apocalyptic number.

It is an amenable number.

28372313 is a deficient number, since it is larger than the sum of its proper divisors (1).

28372313 is an equidigital number, since it uses as much as digits as its factorization.

28372313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 29.

The square root of 28372313 is about 5326.5667178775. The cubic root of 28372313 is about 304.9988820169.

Adding to 28372313 its reverse (31327382), we get a palindrome (59699695).

The spelling of 28372313 in words is "twenty-eight million, three hundred seventy-two thousand, three hundred thirteen".