91939744 has 48 divisors (see below), whose sum is σ = 201678120. Its totient is φ = 40965120.

The previous prime is 91939733. The next prime is 91939747. The reversal of 91939744 is 44793919.

It can be written as a sum of positive squares in 4 ways, for example, as 80784144 + 11155600 = 8988^2 + 3340^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91939694 and 91939703.

It is not an unprimeable number, because it can be changed into a prime (91939747) 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, 8254 + ... + 15874.

Almost surely, 2^91939744 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91939744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100839060).

91939744 is an abundant number, since it is smaller than the sum of its proper divisors (109738376).

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

91939744 is a wasteful number, since it uses less digits than its factorization.

91939744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7673 (or 7665 counting only the distinct ones).

The product of its digits is 244944, while the sum is 46.

The square root of 91939744 is about 9588.5214710090. The cubic root of 91939744 is about 451.3371650946.

The spelling of 91939744 in words is "ninety-one million, nine hundred thirty-nine thousand, seven hundred forty-four".