99643898 has 4 divisors (see below), whose sum is σ = 149465850. Its totient is φ = 49821948.

The previous prime is 99643883. The next prime is 99643931. The reversal of 99643898 is 89834699.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89834699 = 1873 ⋅47963.

It can be written as a sum of positive squares in only one way, i.e., 84143929 + 15499969 = 9173^2 + 3937^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24910973 + ... + 24910976.

Almost surely, 2^99643898 is an apocalyptic number.

99643898 is a deficient number, since it is larger than the sum of its proper divisors (49821952).

99643898 is a wasteful number, since it uses less digits than its factorization.

99643898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49821951.

The product of its digits is 3359232, while the sum is 56.

The square root of 99643898 is about 9982.1790206347. The cubic root of 99643898 is about 463.6072683826.

The spelling of 99643898 in words is "ninety-nine million, six hundred forty-three thousand, eight hundred ninety-eight".