91640367 has 24 divisors (see below), whose sum is σ = 162917664. Its totient is φ = 48337344.

The previous prime is 91640359. The next prime is 91640413. The reversal of 91640367 is 76304619.

91640367 is a `hidden beast` number, since 9 + 1 + 640 + 3 + 6 + 7 = 666.

It is not a de Polignac number, because 91640367 - 2³ = 91640359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91640327) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55128 + ... + 56765.

It is an arithmetic number, because the mean of its divisors is an integer number (6788236).

Almost surely, 2^91640367 is an apocalyptic number.

91640367 is a deficient number, since it is larger than the sum of its proper divisors (71277297).

91640367 is a wasteful number, since it uses less digits than its factorization.

91640367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111919 (or 111916 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 91640367 is about 9572.8975237386. The cubic root of 91640367 is about 450.8467464535.

The spelling of 91640367 in words is "ninety-one million, six hundred forty thousand, three hundred sixty-seven".