28180319 has 2 divisors, whose sum is σ = 28180320. Its totient is φ = 28180318.

The previous prime is 28180309. The next prime is 28180357. The reversal of 28180319 is 91308182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28180319 - 2⁸ = 28180063 is a prime.

It is a super-2 number, since 2×28180319² = 1588260757883522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28180309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14090159 + 14090160.

It is an arithmetic number, because the mean of its divisors is an integer number (14090160).

Almost surely, 2^28180319 is an apocalyptic number.

28180319 is a deficient number, since it is larger than the sum of its proper divisors (1).

28180319 is an equidigital number, since it uses as much as digits as its factorization.

28180319 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 28180319 is about 5308.5138221540. The cubic root of 28180319 is about 304.3093536915.

The spelling of 28180319 in words is "twenty-eight million, one hundred eighty thousand, three hundred nineteen".