99640497 has 16 divisors (see below), whose sum is σ = 146266560. Its totient is φ = 59832000.

The previous prime is 99640493. The next prime is 99640507. The reversal of 99640497 is 79404699.

It is not a de Polignac number, because 99640497 - 2² = 99640493 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99640493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10254 + ... + 17447.

It is an arithmetic number, because the mean of its divisors is an integer number (9141660).

Almost surely, 2^99640497 is an apocalyptic number.

It is an amenable number.

99640497 is a deficient number, since it is larger than the sum of its proper divisors (46626063).

99640497 is a wasteful number, since it uses less digits than its factorization.

99640497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27824.

The product of its (nonzero) digits is 489888, while the sum is 48.

The square root of 99640497 is about 9982.0086655943. The cubic root of 99640497 is about 463.6019937788.

The spelling of 99640497 in words is "ninety-nine million, six hundred forty thousand, four hundred ninety-seven".