28349520 has 80 divisors (see below), whose sum is σ = 92523840. Its totient is φ = 7160832.

The previous prime is 28349479. The next prime is 28349549. The reversal of 28349520 is 2594382.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1452 + ... + 7668.

It is an arithmetic number, because the mean of its divisors is an integer number (1156548).

Almost surely, 2^28349520 is an apocalyptic number.

28349520 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 28349520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46261920).

28349520 is an abundant number, since it is smaller than the sum of its proper divisors (64174320).

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

28349520 is a wasteful number, since it uses less digits than its factorization.

28349520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6252 (or 6246 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 28349520 is about 5324.4267297053. The cubic root of 28349520 is about 304.9171861520.

The spelling of 28349520 in words is "twenty-eight million, three hundred forty-nine thousand, five hundred twenty".