89991728759 has 2 divisors, whose sum is σ = 89991728760. Its totient is φ = 89991728758.

The previous prime is 89991728689. The next prime is 89991728773. The reversal of 89991728759 is 95782719998.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89991728759 is a prime.

It is a super-2 number, since 2×89991728759² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89991728779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44995864379 + 44995864380.

It is an arithmetic number, because the mean of its divisors is an integer number (44995864380).

Almost surely, 2^89991728759 is an apocalyptic number.

89991728759 is a deficient number, since it is larger than the sum of its proper divisors (1).

89991728759 is an equidigital number, since it uses as much as digits as its factorization.

89991728759 is an evil number, because the sum of its binary digits is even.

The product of its digits is 205752960, while the sum is 74.

The spelling of 89991728759 in words is "eighty-nine billion, nine hundred ninety-one million, seven hundred twenty-eight thousand, seven hundred fifty-nine".