99917393728 has 112 divisors (see below), whose sum is σ = 204378056064. Its totient is φ = 48449617920.

The previous prime is 99917393689. The next prime is 99917393747. The reversal of 99917393728 is 82739371999.

It is a Harshad number since it is a multiple of its sum of digits (67).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96912573 + ... + 96913603.

It is an arithmetic number, because the mean of its divisors is an integer number (1824804072).

Almost surely, 2^99917393728 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 99917393728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102189028032).

99917393728 is an abundant number, since it is smaller than the sum of its proper divisors (104460662336).

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

99917393728 is a wasteful number, since it uses less digits than its factorization.

99917393728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1440 (or 1430 counting only the distinct ones).

The product of its digits is 46294416, while the sum is 67.

It can be divided in two parts, 999173 and 93728, that added together give a palindrome (1092901).

The spelling of 99917393728 in words is "ninety-nine billion, nine hundred seventeen million, three hundred ninety-three thousand, seven hundred twenty-eight".