29812447820 has 24 divisors (see below), whose sum is σ = 64062099024. Its totient is φ = 11647653696.

The previous prime is 29812447811. The next prime is 29812447837. The reversal of 29812447820 is 2874421892.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17331959 + ... + 17333678.

It is an arithmetic number, because the mean of its divisors is an integer number (2669254126).

Almost surely, 2^29812447820 is an apocalyptic number.

29812447820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

29812447820 is an abundant number, since it is smaller than the sum of its proper divisors (34249651204).

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

29812447820 is a wasteful number, since it uses less digits than its factorization.

29812447820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34665689 (or 34665687 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 47.

The spelling of 29812447820 in words is "twenty-nine billion, eight hundred twelve million, four hundred forty-seven thousand, eight hundred twenty".