28704880 has 20 divisors (see below), whose sum is σ = 66739032. Its totient is φ = 11481920.

The previous prime is 28704811. The next prime is 28704883. The reversal of 28704880 is 8840782.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28704883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179326 + ... + 179485.

Almost surely, 2^28704880 is an apocalyptic number.

28704880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28704880 is an abundant number, since it is smaller than the sum of its proper divisors (38034152).

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

28704880 is a wasteful number, since it uses less digits than its factorization.

28704880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358824 (or 358818 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 37.

The square root of 28704880 is about 5357.6935336019. The cubic root of 28704880 is about 306.1859407872.

It can be divided in two parts, 28704 and 880, that added together give a square (29584 = 172²).

The spelling of 28704880 in words is "twenty-eight million, seven hundred four thousand, eight hundred eighty".