91500478240 has 48 divisors (see below), whose sum is σ = 219713671800. Its totient is φ = 36000184320.

The previous prime is 91500478213. The next prime is 91500478259. The reversal of 91500478240 is 4287400519.

It can be written as a sum of positive squares in 4 ways, for example, as 77099518224 + 14400960016 = 277668^2 + 120004^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 91500478193 and 91500478202.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4677765 + ... + 4697284.

Almost surely, 2^91500478240 is an apocalyptic number.

It is an amenable number.

91500478240 is an abundant number, since it is smaller than the sum of its proper divisors (128213193560).

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

91500478240 is a wasteful number, since it uses less digits than its factorization.

91500478240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9375125 (or 9375117 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 40.

Adding to 91500478240 its reverse (4287400519), we get a palindrome (95787878759).

The spelling of 91500478240 in words is "ninety-one billion, five hundred million, four hundred seventy-eight thousand, two hundred forty".