99728737 has 4 divisors (see below), whose sum is σ = 99951300. Its totient is φ = 99506176.

The previous prime is 99728729. The next prime is 99728743. The reversal of 99728737 is 73782799.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73782799 = 569 ⋅129671.

It can be written as a sum of positive squares in 2 ways, for example, as 74718736 + 25010001 = 8644^2 + 5001^2 .

It is a cyclic number.

It is not a de Polignac number, because 99728737 - 2³ = 99728729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99728537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110608 + ... + 111505.

It is an arithmetic number, because the mean of its divisors is an integer number (24987825).

Almost surely, 2^99728737 is an apocalyptic number.

It is an amenable number.

99728737 is a deficient number, since it is larger than the sum of its proper divisors (222563).

99728737 is a wasteful number, since it uses less digits than its factorization.

99728737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222562.

The product of its digits is 1333584, while the sum is 52.

The square root of 99728737 is about 9986.4276395516. The cubic root of 99728737 is about 463.7388061901.

The spelling of 99728737 in words is "ninety-nine million, seven hundred twenty-eight thousand, seven hundred thirty-seven".