29681420 has 36 divisors (see below), whose sum is σ = 65800224. Its totient is φ = 11244960.

The previous prime is 29681419. The next prime is 29681453. The reversal of 29681420 is 2418692.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5165 + ... + 9275.

It is an arithmetic number, because the mean of its divisors is an integer number (1827784).

Almost surely, 2^29681420 is an apocalyptic number.

29681420 is a gapful number since it is divisible by the number (20) 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 29681420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32900112).

29681420 is an abundant number, since it is smaller than the sum of its proper divisors (36118804).

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

29681420 is a wasteful number, since it uses less digits than its factorization.

29681420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4158 (or 4137 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 29681420 is about 5448.0657117917. The cubic root of 29681420 is about 309.6194428339.

The spelling of 29681420 in words is "twenty-nine million, six hundred eighty-one thousand, four hundred twenty".