99728738 has 16 divisors (see below), whose sum is σ = 155063160. Its totient is φ = 48048000.

The previous prime is 99728729. The next prime is 99728743. The reversal of 99728738 is 83782799.

It can be written as a sum of positive squares in 4 ways, for example, as 97081609 + 2647129 = 9853^2 + 1627^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 99728738.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33428 + ... + 36288.

Almost surely, 2^99728738 is an apocalyptic number.

99728738 is a deficient number, since it is larger than the sum of its proper divisors (55334422).

99728738 is a wasteful number, since it uses less digits than its factorization.

99728738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3493.

The product of its digits is 1524096, while the sum is 53.

The square root of 99728738 is about 9986.4276896195. The cubic root of 99728738 is about 463.7388077401.

The spelling of 99728738 in words is "ninety-nine million, seven hundred twenty-eight thousand, seven hundred thirty-eight".