28561488 has 80 divisors (see below), whose sum is σ = 76602240. Its totient is φ = 9165312.

The previous prime is 28561471. The next prime is 28561493. The reversal of 28561488 is 88416582.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 261978 + ... + 262086.

It is an arithmetic number, because the mean of its divisors is an integer number (957528).

Almost surely, 2^28561488 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 28561488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38301120).

28561488 is an abundant number, since it is smaller than the sum of its proper divisors (48040752).

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

28561488 is a wasteful number, since it uses less digits than its factorization.

28561488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276 (or 270 counting only the distinct ones).

The product of its digits is 122880, while the sum is 42.

The square root of 28561488 is about 5344.2949020427. The cubic root of 28561488 is about 305.6752503304.

The spelling of 28561488 in words is "twenty-eight million, five hundred sixty-one thousand, four hundred eighty-eight".