91247040 has 224 divisors, whose sum is σ = 329184000. Its totient is φ = 23786496.

The previous prime is 91247011. The next prime is 91247047. The reversal of 91247040 is 4074219.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 91246995 and 91247013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91247047) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 509671 + ... + 509849.

Almost surely, 2^91247040 is an apocalyptic number.

91247040 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91247040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164592000).

91247040 is an abundant number, since it is smaller than the sum of its proper divisors (237936960).

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

91247040 is a wasteful number, since it uses less digits than its factorization.

91247040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264 (or 248 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 91247040 is about 9552.3316525338. The cubic root of 91247040 is about 450.2007992748.

The spelling of 91247040 in words is "ninety-one million, two hundred forty-seven thousand, forty".