28725913091 has 2 divisors, whose sum is σ = 28725913092. Its totient is φ = 28725913090.

The previous prime is 28725913079. The next prime is 28725913207. The reversal of 28725913091 is 19031952782.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28725913091 - 2²⁶ = 28658804227 is a prime.

It is not a weakly prime, because it can be changed into another prime (28725913031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14362956545 + 14362956546.

It is an arithmetic number, because the mean of its divisors is an integer number (14362956546).

Almost surely, 2^28725913091 is an apocalyptic number.

28725913091 is a deficient number, since it is larger than the sum of its proper divisors (1).

28725913091 is an equidigital number, since it uses as much as digits as its factorization.

28725913091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 47.

The spelling of 28725913091 in words is "twenty-eight billion, seven hundred twenty-five million, nine hundred thirteen thousand, ninety-one".