91530240 has 176 divisors, whose sum is σ = 300663360. Its totient is φ = 23756800.

The previous prime is 91530233. The next prime is 91530251. The reversal of 91530240 is 4203519.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 91530240.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 906190 + ... + 906290.

Almost surely, 2^91530240 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 91530240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150331680).

91530240 is an abundant number, since it is smaller than the sum of its proper divisors (209133120).

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

91530240 is a wasteful number, since it uses less digits than its factorization.

91530240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188 (or 170 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 91530240 is about 9567.1437743979. The cubic root of 91530240 is about 450.6660753389. Note that the first 3 decimals are identical.

Adding to 91530240 its reverse (4203519), we get a palindrome (95733759).

The spelling of 91530240 in words is "ninety-one million, five hundred thirty thousand, two hundred forty".