9899779932 has 96 divisors (see below), whose sum is σ = 31058173440. Its totient is φ = 2662122240.

The previous prime is 9899779871. The next prime is 9899779933. The reversal of 9899779932 is 2399779989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9899779933) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 372294 + ... + 397997.

It is an arithmetic number, because the mean of its divisors is an integer number (323522640).

Almost surely, 2^9899779932 is an apocalyptic number.

It is an amenable number.

9899779932 is an abundant number, since it is smaller than the sum of its proper divisors (21158393508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9899779932 is a wasteful number, since it uses less digits than its factorization.

9899779932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770328 (or 770320 counting only the distinct ones).

The product of its digits is 138883248, while the sum is 72.

The square root of 9899779932 is about 99497.6378212066. The cubic root of 9899779932 is about 2147.2132585836.

It can be divided in two parts, 98997 and 79932, that added together give a square (178929 = 423²).

The spelling of 9899779932 in words is "nine billion, eight hundred ninety-nine million, seven hundred seventy-nine thousand, nine hundred thirty-two".