91249878 has 16 divisors (see below), whose sum is σ = 190434816. Its totient is φ = 29094120.

The previous prime is 91249867. The next prime is 91249919. The reversal of 91249878 is 87894219.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 330478 + ... + 330753.

It is an arithmetic number, because the mean of its divisors is an integer number (11902176).

Almost surely, 2^91249878 is an apocalyptic number.

91249878 is an abundant number, since it is smaller than the sum of its proper divisors (99184938).

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

91249878 is a wasteful number, since it uses less digits than its factorization.

91249878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661259.

The product of its digits is 290304, while the sum is 48.

The square root of 91249878 is about 9552.4802014974. The cubic root of 91249878 is about 450.2054666650.

The spelling of 91249878 in words is "ninety-one million, two hundred forty-nine thousand, eight hundred seventy-eight".