28572391 has 2 divisors, whose sum is σ = 28572392. Its totient is φ = 28572390.

The previous prime is 28572347. The next prime is 28572403. The reversal of 28572391 is 19327582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28572391 - 2¹⁷ = 28441319 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28572391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28572301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14286195 + 14286196.

It is an arithmetic number, because the mean of its divisors is an integer number (14286196).

Almost surely, 2^28572391 is an apocalyptic number.

28572391 is a deficient number, since it is larger than the sum of its proper divisors (1).

28572391 is an equidigital number, since it uses as much as digits as its factorization.

28572391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 37.

The square root of 28572391 is about 5345.3148644397. The cubic root of 28572391 is about 305.7141413161.

The spelling of 28572391 in words is "twenty-eight million, five hundred seventy-two thousand, three hundred ninety-one".