28623627391 has 2 divisors, whose sum is σ = 28623627392. Its totient is φ = 28623627390.

The previous prime is 28623627353. The next prime is 28623627421. The reversal of 28623627391 is 19372632682.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28623627391 - 2³³ = 20033692799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28623627301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14311813695 + 14311813696.

It is an arithmetic number, because the mean of its divisors is an integer number (14311813696).

Almost surely, 2^28623627391 is an apocalyptic number.

28623627391 is a deficient number, since it is larger than the sum of its proper divisors (1).

28623627391 is an equidigital number, since it uses as much as digits as its factorization.

28623627391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 49.

The spelling of 28623627391 in words is "twenty-eight billion, six hundred twenty-three million, six hundred twenty-seven thousand, three hundred ninety-one".