99640490 has 8 divisors (see below), whose sum is σ = 179352900. Its totient is φ = 39856192.

The previous prime is 99640487. The next prime is 99640493. The reversal of 99640490 is 9404699.

It is an interprime number because it is at equal distance from previous prime (99640487) and next prime (99640493).

It can be written as a sum of positive squares in 2 ways, for example, as 92409769 + 7230721 = 9613^2 + 2689^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 4982015 + ... + 4982034.

Almost surely, 2^99640490 is an apocalyptic number.

99640490 is a deficient number, since it is larger than the sum of its proper divisors (79712410).

99640490 is a wasteful number, since it uses less digits than its factorization.

99640490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9964056.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 99640490 is about 9982.0083149635. The cubic root of 99640490 is about 463.6019829224.

The spelling of 99640490 in words is "ninety-nine million, six hundred forty thousand, four hundred ninety".