91038738 has 64 divisors (see below), whose sum is σ = 220280832. Its totient is φ = 24520320.

The previous prime is 91038691. The next prime is 91038751. The reversal of 91038738 is 83783019.

It is a super-3 number, since 3×91038738³ (a number of 25 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91038696 and 91038705.

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 31 ways as a sum of consecutive naturals, for example, 69873 + ... + 71163.

It is an arithmetic number, because the mean of its divisors is an integer number (3441888).

Almost surely, 2^91038738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91038738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110140416).

91038738 is an abundant number, since it is smaller than the sum of its proper divisors (129242094).

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

91038738 is a wasteful number, since it uses less digits than its factorization.

91038738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1399.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 91038738 is about 9541.4222210318. The cubic root of 91038738 is about 449.8579601089.

The spelling of 91038738 in words is "ninety-one million, thirty-eight thousand, seven hundred thirty-eight".