91878740449 has 16 divisors (see below), whose sum is σ = 95674360320. Its totient is φ = 88165808640.

The previous prime is 91878740431. The next prime is 91878740453. The reversal of 91878740449 is 94404787819.

It is a cyclic number.

It is not a de Polignac number, because 91878740449 - 2¹⁵ = 91878707681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91878740489) 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, 797929 + ... + 905785.

It is an arithmetic number, because the mean of its divisors is an integer number (5979647520).

Almost surely, 2^91878740449 is an apocalyptic number.

It is an amenable number.

91878740449 is a deficient number, since it is larger than the sum of its proper divisors (3795619871).

91878740449 is a wasteful number, since it uses less digits than its factorization.

91878740449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108240.

The product of its (nonzero) digits is 16257024, while the sum is 61.

The spelling of 91878740449 in words is "ninety-one billion, eight hundred seventy-eight million, seven hundred forty thousand, four hundred forty-nine".