91560240 has 320 divisors, whose sum is σ = 349977600. Its totient is φ = 21897216.

The previous prime is 91560239. The next prime is 91560247. The reversal of 91560240 is 4206519.

91560240 = 1676² + 1677² + ... + 1707².

91560240 is a `hidden beast` number, since 9 + 15 + 602 + 40 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91560247) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 943872 + ... + 943968.

It is an arithmetic number, because the mean of its divisors is an integer number (1093680).

Almost surely, 2^91560240 is an apocalyptic number.

91560240 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 91560240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174988800).

91560240 is an abundant number, since it is smaller than the sum of its proper divisors (258417360).

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

91560240 is a wasteful number, since it uses less digits than its factorization.

91560240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 91560240 is about 9568.7115120062. The cubic root of 91560240 is about 450.7153068112.

Adding to 91560240 its reverse (4206519), we get a palindrome (95766759).

The spelling of 91560240 in words is "ninety-one million, five hundred sixty thousand, two hundred forty".