91046640 has 80 divisors (see below), whose sum is σ = 289901088. Its totient is φ = 23620608.

The previous prime is 91046639. The next prime is 91046647. The reversal of 91046640 is 4664019.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 91046598 and 91046607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91046647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3754 + ... + 14006.

Almost surely, 2^91046640 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 91046640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144950544).

91046640 is an abundant number, since it is smaller than the sum of its proper divisors (198854448).

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

91046640 is a wasteful number, since it uses less digits than its factorization.

91046640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10306 (or 10300 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 91046640 is about 9541.8363012577. The cubic root of 91046640 is about 449.8709753551.

The spelling of 91046640 in words is "ninety-one million, forty-six thousand, six hundred forty".