28929520 has 40 divisors (see below), whose sum is σ = 68540256. Its totient is φ = 11351808.

The previous prime is 28929517. The next prime is 28929547. The reversal of 28929520 is 2592982.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 28929520.

It is a congruent number.

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, 829 + ... + 7651.

Almost surely, 2^28929520 is an apocalyptic number.

28929520 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 28929520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34270128).

28929520 is an abundant number, since it is smaller than the sum of its proper divisors (39610736).

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

28929520 is a wasteful number, since it uses less digits than its factorization.

28929520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6889 (or 6883 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 28929520 is about 5378.6169225926. The cubic root of 28929520 is about 306.9825876871.

The spelling of 28929520 in words is "twenty-eight million, nine hundred twenty-nine thousand, five hundred twenty".