91250838 has 72 divisors (see below), whose sum is σ = 231423192. Its totient is φ = 25909632.

The previous prime is 91250827. The next prime is 91250869. The reversal of 91250838 is 83805219.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 270606 + ... + 270942.

It is an arithmetic number, because the mean of its divisors is an integer number (3214211).

Almost surely, 2^91250838 is an apocalyptic number.

91250838 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 91250838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115711596).

91250838 is an abundant number, since it is smaller than the sum of its proper divisors (140172354).

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

91250838 is a wasteful number, since it uses less digits than its factorization.

91250838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666 (or 656 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 91250838 is about 9552.5304500954. The cubic root of 91250838 is about 450.2070454643.

The spelling of 91250838 in words is "ninety-one million, two hundred fifty thousand, eight hundred thirty-eight".