91249860 has 72 divisors (see below), whose sum is σ = 276696000. Its totient is φ = 22459008.

The previous prime is 91249849. The next prime is 91249861. The reversal of 91249860 is 6894219.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (91249861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5641 + ... + 14639.

It is an arithmetic number, because the mean of its divisors is an integer number (3843000).

Almost surely, 2^91249860 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 91249860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138348000).

91249860 is an abundant number, since it is smaller than the sum of its proper divisors (185446140).

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

91249860 is a wasteful number, since it uses less digits than its factorization.

91249860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9037 (or 9022 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 91249860 is about 9552.4792593337. The cubic root of 91249860 is about 450.2054370624.

The spelling of 91249860 in words is "ninety-one million, two hundred forty-nine thousand, eight hundred sixty".