91503540 has 96 divisors (see below), whose sum is σ = 286272000. Its totient is φ = 24264576.

The previous prime is 91503463. The next prime is 91503541. The reversal of 91503540 is 4530519.

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 (91503541) 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, 128706 + ... + 129414.

It is an arithmetic number, because the mean of its divisors is an integer number (2982000).

Almost surely, 2^91503540 is an apocalyptic number.

91503540 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 91503540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143136000).

91503540 is an abundant number, since it is smaller than the sum of its proper divisors (194768460).

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

91503540 is a wasteful number, since it uses less digits than its factorization.

91503540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 966 (or 958 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 91503540 is about 9565.7482718290. The cubic root of 91503540 is about 450.6222502803.

The spelling of 91503540 in words is "ninety-one million, five hundred three thousand, five hundred forty".