99180181728 has 336 divisors, whose sum is σ = 299315199456. Its totient is φ = 32328253440.

The previous prime is 99180181717. The next prime is 99180181739. The reversal of 99180181728 is 82718108199.

It is an interprime number because it is at equal distance from previous prime (99180181717) and next prime (99180181739).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 385914976 + ... + 385915232.

It is an arithmetic number, because the mean of its divisors is an integer number (890819046).

Almost surely, 2^99180181728 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 99180181728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149657599728).

99180181728 is an abundant number, since it is smaller than the sum of its proper divisors (200135017728).

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

99180181728 is a wasteful number, since it uses less digits than its factorization.

99180181728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589 (or 566 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 54.

The spelling of 99180181728 in words is "ninety-nine billion, one hundred eighty million, one hundred eighty-one thousand, seven hundred twenty-eight".