91385740 has 24 divisors (see below), whose sum is σ = 193066272. Its totient is φ = 36334080.

The previous prime is 91385729. The next prime is 91385741. The reversal of 91385740 is 4758319.

It is a self number, because there is not a number n which added to its sum of digits gives 91385740.

It is not an unprimeable number, because it can be changed into a prime (91385741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10341 + ... + 17020.

It is an arithmetic number, because the mean of its divisors is an integer number (8044428).

Almost surely, 2^91385740 is an apocalyptic number.

It is an amenable number.

91385740 is an abundant number, since it is smaller than the sum of its proper divisors (101680532).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91385740 is a wasteful number, since it uses less digits than its factorization.

91385740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27537 (or 27535 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 91385740 is about 9559.5889032950. The cubic root of 91385740 is about 450.4287929310.

It can be divided in two parts, 9138 and 5740, that added together give a triangular number (14878 = T₁₇₂).

The spelling of 91385740 in words is "ninety-one million, three hundred eighty-five thousand, seven hundred forty".