28453391 has 2 divisors, whose sum is σ = 28453392. Its totient is φ = 28453390.

The previous prime is 28453363. The next prime is 28453409. The reversal of 28453391 is 19335482.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28453391 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28453361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14226695 + 14226696.

It is an arithmetic number, because the mean of its divisors is an integer number (14226696).

Almost surely, 2^28453391 is an apocalyptic number.

28453391 is a deficient number, since it is larger than the sum of its proper divisors (1).

28453391 is an equidigital number, since it uses as much as digits as its factorization.

28453391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 35.

The square root of 28453391 is about 5334.1720069754. The cubic root of 28453391 is about 305.2891318977.

The spelling of 28453391 in words is "twenty-eight million, four hundred fifty-three thousand, three hundred ninety-one".