29990880 has 144 divisors (see below), whose sum is σ = 104373360. Its totient is φ = 7839744.

The previous prime is 29990867. The next prime is 29990881. The reversal of 29990880 is 8809992.

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 (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29990881) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84784 + ... + 85136.

It is an arithmetic number, because the mean of its divisors is an integer number (724815).

Almost surely, 2^29990880 is an apocalyptic number.

29990880 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 29990880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52186680).

29990880 is an abundant number, since it is smaller than the sum of its proper divisors (74382480).

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

29990880 is a wasteful number, since it uses less digits than its factorization.

29990880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433 (or 422 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 29990880 is about 5476.3929734817. The cubic root of 29990880 is about 310.6917607815.

The spelling of 29990880 in words is "twenty-nine million, nine hundred ninety thousand, eight hundred eighty".