99728388394 has 4 divisors (see below), whose sum is σ = 149592582594. Its totient is φ = 49864194196.

The previous prime is 99728388323. The next prime is 99728388433. The reversal of 99728388394 is 49388382799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49388382799 = 7 ⋅7055483257.

It can be written as a sum of positive squares in only one way, i.e., 87471020025 + 12257368369 = 295755^2 + 110713^2 .

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 as a sum of consecutive naturals, namely, 24932097097 + ... + 24932097100.

Almost surely, 2^99728388394 is an apocalyptic number.

99728388394 is a deficient number, since it is larger than the sum of its proper divisors (49864194200).

99728388394 is a wasteful number, since it uses less digits than its factorization.

99728388394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49864194199.

The product of its digits is 188116992, while the sum is 70.

The spelling of 99728388394 in words is "ninety-nine billion, seven hundred twenty-eight million, three hundred eighty-eight thousand, three hundred ninety-four".