91299840 has 112 divisors (see below), whose sum is σ = 292534848. Its totient is φ = 24313856.

The previous prime is 91299833. The next prime is 91299841. The reversal of 91299840 is 4899219.

It is a junction number, because it is equal to n+sod(n) for n = 91299792 and 91299801.

It is not an unprimeable number, because it can be changed into a prime (91299841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122509 + ... + 123251.

Almost surely, 2^91299840 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 91299840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146267424).

91299840 is an abundant number, since it is smaller than the sum of its proper divisors (201235008).

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

91299840 is an equidigital number, since it uses as much as digits as its factorization.

91299840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777 (or 753 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 91299840 is about 9555.0949759801. The cubic root of 91299840 is about 450.2876185978.

The spelling of 91299840 in words is "ninety-one million, two hundred ninety-nine thousand, eight hundred forty".