99890642 has 8 divisors (see below), whose sum is σ = 150664332. Its totient is φ = 49669200.

The previous prime is 99890627. The next prime is 99890647. The reversal of 99890642 is 24609899.

It can be written as a sum of positive squares in 2 ways, for example, as 77810041 + 22080601 = 8821^2 + 4699^2 .

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 (99890647) 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, 137609 + ... + 138332.

Almost surely, 2^99890642 is an apocalyptic number.

99890642 is a deficient number, since it is larger than the sum of its proper divisors (50773690).

99890642 is a wasteful number, since it uses less digits than its factorization.

99890642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276124.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 99890642 is about 9994.5306042855. The cubic root of 99890642 is about 463.9896233559.

The spelling of 99890642 in words is "ninety-nine million, eight hundred ninety thousand, six hundred forty-two".