99540528 has 80 divisors (see below), whose sum is σ = 272363520. Its totient is φ = 31272192.

The previous prime is 99540523. The next prime is 99540533. The reversal of 99540528 is 82504599.

It is a Cunningham number, because it is equal to 9977²-1.

It is an interprime number because it is at equal distance from previous prime (99540523) and next prime (99540533).

It is a self number, because there is not a number n which added to its sum of digits gives 99540528.

It is not an unprimeable number, because it can be changed into a prime (99540523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59025 + ... + 60687.

It is an arithmetic number, because the mean of its divisors is an integer number (3404544).

Almost surely, 2^99540528 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 99540528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136181760).

99540528 is an abundant number, since it is smaller than the sum of its proper divisors (172822992).

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

99540528 is a wasteful number, since it uses less digits than its factorization.

99540528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1746 (or 1740 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 42.

The square root of 99540528 is about 9976.9999498847. Note that the first 4 decimals coincide. The cubic root of 99540528 is about 463.4468984200.

The spelling of 99540528 in words is "ninety-nine million, five hundred forty thousand, five hundred twenty-eight".