91779027 has 16 divisors (see below), whose sum is σ = 123654048. Its totient is φ = 60549120.

The previous prime is 91779011. The next prime is 91779047. The reversal of 91779027 is 72097719.

It is not a de Polignac number, because 91779027 - 2⁴ = 91779011 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91779027.

It is not an unprimeable number, because it can be changed into a prime (91779047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169377 + ... + 169917.

It is an arithmetic number, because the mean of its divisors is an integer number (7728378).

Almost surely, 2^91779027 is an apocalyptic number.

91779027 is a deficient number, since it is larger than the sum of its proper divisors (31875021).

91779027 is a wasteful number, since it uses less digits than its factorization.

91779027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1030.

The product of its (nonzero) digits is 55566, while the sum is 42.

The square root of 91779027 is about 9580.1371075784. The cubic root of 91779027 is about 451.0740222289.

The spelling of 91779027 in words is "ninety-one million, seven hundred seventy-nine thousand, twenty-seven".