9899629988 has 12 divisors (see below), whose sum is σ = 17543648640. Its totient is φ = 4887158952.

The previous prime is 9899629951. The next prime is 9899629991. The reversal of 9899629988 is 8899269989.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15663656 + ... + 15664287.

It is an arithmetic number, because the mean of its divisors is an integer number (1461970720).

Almost surely, 2^9899629988 is an apocalyptic number.

It is an amenable number.

9899629988 is a deficient number, since it is larger than the sum of its proper divisors (7644018652).

9899629988 is a wasteful number, since it uses less digits than its factorization.

9899629988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31328026 (or 31328024 counting only the distinct ones).

The product of its digits is 362797056, while the sum is 77.

The square root of 9899629988 is about 99496.8843130276. The cubic root of 9899629988 is about 2147.2024178251.

The spelling of 9899629988 in words is "nine billion, eight hundred ninety-nine million, six hundred twenty-nine thousand, nine hundred eighty-eight".