29978978832 has 120 divisors (see below), whose sum is σ = 91770063840. Its totient is φ = 9060387840.

The previous prime is 29978978801. The next prime is 29978978857. The reversal of 29978978832 is 23887987992.

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

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, 575368 + ... + 625304.

It is an arithmetic number, because the mean of its divisors is an integer number (764750532).

Almost surely, 2^29978978832 is an apocalyptic number.

29978978832 is a gapful number since it is divisible by the number (22) 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 29978978832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45885031920).

29978978832 is an abundant number, since it is smaller than the sum of its proper divisors (61791085008).

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

29978978832 is a wasteful number, since it uses less digits than its factorization.

29978978832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50341 (or 50332 counting only the distinct ones).

The product of its digits is 219469824, while the sum is 72.

The spelling of 29978978832 in words is "twenty-nine billion, nine hundred seventy-eight million, nine hundred seventy-eight thousand, eight hundred thirty-two".