28745891 has 2 divisors, whose sum is σ = 28745892. Its totient is φ = 28745890.

The previous prime is 28745839. The next prime is 28745903. The reversal of 28745891 is 19854782.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28745891 is a prime.

It is not a weakly prime, because it can be changed into another prime (28745831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14372945 + 14372946.

It is an arithmetic number, because the mean of its divisors is an integer number (14372946).

Almost surely, 2^28745891 is an apocalyptic number.

28745891 is a deficient number, since it is larger than the sum of its proper divisors (1).

28745891 is an equidigital number, since it uses as much as digits as its factorization.

28745891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 44.

The square root of 28745891 is about 5361.5194674644. The cubic root of 28745891 is about 306.3316885515.

The spelling of 28745891 in words is "twenty-eight million, seven hundred forty-five thousand, eight hundred ninety-one".