99628997 has 4 divisors (see below), whose sum is σ = 107292780. Its totient is φ = 91965216.

The previous prime is 99628987. The next prime is 99629017. The reversal of 99628997 is 79982699.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51825601 + 47803396 = 7199^2 + 6914^2 .

It is a cyclic number.

It is not a de Polignac number, because 99628997 - 2¹² = 99624901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99628927) 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, 3831872 + ... + 3831897.

It is an arithmetic number, because the mean of its divisors is an integer number (26823195).

Almost surely, 2^99628997 is an apocalyptic number.

It is an amenable number.

99628997 is a deficient number, since it is larger than the sum of its proper divisors (7663783).

99628997 is a wasteful number, since it uses less digits than its factorization.

99628997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7663782.

The product of its digits is 4408992, while the sum is 59.

The square root of 99628997 is about 9981.4326126063. The cubic root of 99628997 is about 463.5841575635.

The spelling of 99628997 in words is "ninety-nine million, six hundred twenty-eight thousand, nine hundred ninety-seven".