91926640 has 80 divisors (see below), whose sum is σ = 232047648. Its totient is φ = 33666048.

The previous prime is 91926629. The next prime is 91926643. The reversal of 91926640 is 4662919.

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

It is a self number, because there is not a number n which added to its sum of digits gives 91926640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91926643) 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, 162999 + ... + 163561.

Almost surely, 2^91926640 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 91926640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116023824).

91926640 is an abundant number, since it is smaller than the sum of its proper divisors (140121008).

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

91926640 is a wasteful number, since it uses less digits than its factorization.

91926640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746 (or 740 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 91926640 is about 9587.8381296307. The cubic root of 91926640 is about 451.3157213281.

The spelling of 91926640 in words is "ninety-one million, nine hundred twenty-six thousand, six hundred forty".