28528045991 has 2 divisors, whose sum is σ = 28528045992. Its totient is φ = 28528045990.

The previous prime is 28528045969. The next prime is 28528046009. The reversal of 28528045991 is 19954082582.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28528045991 - 2²² = 28523851687 is a prime.

It is a super-2 number, since 2×28528045991² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28528045391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14264022995 + 14264022996.

It is an arithmetic number, because the mean of its divisors is an integer number (14264022996).

Almost surely, 2^28528045991 is an apocalyptic number.

28528045991 is a deficient number, since it is larger than the sum of its proper divisors (1).

28528045991 is an equidigital number, since it uses as much as digits as its factorization.

28528045991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2073600, while the sum is 53.

The spelling of 28528045991 in words is "twenty-eight billion, five hundred twenty-eight million, forty-five thousand, nine hundred ninety-one".