29403889920 has 144 divisors (see below), whose sum is σ = 104343093120. Its totient is φ = 7841028096.

The previous prime is 29403889919. The next prime is 29403889937. The reversal of 29403889920 is 2998830492.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 390844 + ... + 459963.

Almost surely, 2^29403889920 is an apocalyptic number.

29403889920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

29403889920 is an abundant number, since it is smaller than the sum of its proper divisors (74939203200).

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

29403889920 is an equidigital number, since it uses as much as digits as its factorization.

29403889920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850837 (or 850817 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The spelling of 29403889920 in words is "twenty-nine billion, four hundred three million, eight hundred eighty-nine thousand, nine hundred twenty".