9999999432 has 96 divisors (see below), whose sum is σ = 28285171200. Its totient is φ = 3185664768.

The previous prime is 9999999379. The next prime is 9999999479. The reversal of 9999999432 is 2349999999.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2911188 + ... + 2914620.

It is an arithmetic number, because the mean of its divisors is an integer number (294637200).

Almost surely, 2^9999999432 is an apocalyptic number.

9999999432 is a gapful number since it is divisible by the number (92) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9999999432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14142585600).

9999999432 is an abundant number, since it is smaller than the sum of its proper divisors (18285171768).

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

9999999432 is a wasteful number, since it uses less digits than its factorization.

9999999432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5227 (or 5220 counting only the distinct ones).

The product of its digits is 114791256, while the sum is 72.

The square root of 9999999432 is about 99999.9971600000. The cubic root of 9999999432 is about 2154.4346492413.

The spelling of 9999999432 in words is "nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, four hundred thirty-two".