28720488 has 64 divisors (see below), whose sum is σ = 74468160. Its totient is φ = 9225216.

The previous prime is 28720487. The next prime is 28720507. The reversal of 28720488 is 88402782.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28720487) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85056 + ... + 85392.

It is an arithmetic number, because the mean of its divisors is an integer number (1163565).

Almost surely, 2^28720488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28720488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37234080).

28720488 is an abundant number, since it is smaller than the sum of its proper divisors (45747672).

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

28720488 is a wasteful number, since it uses less digits than its factorization.

28720488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466 (or 462 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 39.

The square root of 28720488 is about 5359.1499325919. The cubic root of 28720488 is about 306.2414259435.

The spelling of 28720488 in words is "twenty-eight million, seven hundred twenty thousand, four hundred eighty-eight".