28929920 has 64 divisors (see below), whose sum is σ = 73256400. Its totient is φ = 10887168.

The previous prime is 28929889. The next prime is 28929977. The reversal of 28929920 is 2992982.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9551 + ... + 12209.

Almost surely, 2^28929920 is an apocalyptic number.

28929920 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 28929920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36628200).

28929920 is an abundant number, since it is smaller than the sum of its proper divisors (44326480).

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

28929920 is a wasteful number, since it uses less digits than its factorization.

28929920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2695 (or 2683 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 28929920 is about 5378.6541067445. The cubic root of 28929920 is about 306.9840025334.

The spelling of 28929920 in words is "twenty-eight million, nine hundred twenty-nine thousand, nine hundred twenty".