99800642 has 16 divisors (see below), whose sum is σ = 162375192. Its totient is φ = 45818880.

The previous prime is 99800641. The next prime is 99800651. The reversal of 99800642 is 24600899.

It can be written as a sum of positive squares in 4 ways, for example, as 71081761 + 28718881 = 8431^2 + 5359^2 .

It is a super-2 number, since 2×99800642² = 19920336287224328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 99800596 and 99800605.

It is not an unprimeable number, because it can be changed into a prime (99800641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34403 + ... + 37190.

Almost surely, 2^99800642 is an apocalyptic number.

99800642 is a deficient number, since it is larger than the sum of its proper divisors (62574550).

99800642 is a wasteful number, since it uses less digits than its factorization.

99800642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71653.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 99800642 is about 9990.0271270903. The cubic root of 99800642 is about 463.8502322078.

The spelling of 99800642 in words is "ninety-nine million, eight hundred thousand, six hundred forty-two".