91501680 has 80 divisors (see below), whose sum is σ = 285517440. Its totient is φ = 24240384.

The previous prime is 91501673. The next prime is 91501681. The reversal of 91501680 is 8610519.

It is a happy number.

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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (91501681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37951 + ... + 40289.

It is an arithmetic number, because the mean of its divisors is an integer number (3568968).

Almost surely, 2^91501680 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 91501680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142758720).

91501680 is an abundant number, since it is smaller than the sum of its proper divisors (194015760).

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

91501680 is a wasteful number, since it uses less digits than its factorization.

91501680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2518 (or 2512 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 91501680 is about 9565.6510494582. The cubic root of 91501680 is about 450.6191969810.

The spelling of 91501680 in words is "ninety-one million, five hundred one thousand, six hundred eighty".