91787894 has 16 divisors (see below), whose sum is σ = 156729600. Its totient is φ = 39907560.

The previous prime is 91787887. The next prime is 91787897. The reversal of 91787894 is 49878719.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91787897) 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, 90194 + ... + 91205.

It is an arithmetic number, because the mean of its divisors is an integer number (9795600).

Almost surely, 2^91787894 is an apocalyptic number.

91787894 is a deficient number, since it is larger than the sum of its proper divisors (64941706).

91787894 is a wasteful number, since it uses less digits than its factorization.

91787894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181435.

The product of its digits is 1016064, while the sum is 53.

The square root of 91787894 is about 9580.5998768344. The cubic root of 91787894 is about 451.0885482220.

The spelling of 91787894 in words is "ninety-one million, seven hundred eighty-seven thousand, eight hundred ninety-four".