28613788 has 48 divisors (see below), whose sum is σ = 61931520. Its totient is φ = 11287296.

The previous prime is 28613773. The next prime is 28613789. The reversal of 28613788 is 88731682.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28613789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21733 + ... + 23011.

It is an arithmetic number, because the mean of its divisors is an integer number (1290240).

Almost surely, 2^28613788 is an apocalyptic number.

28613788 is a gapful number since it is divisible by the number (28) 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 28613788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30965760).

28613788 is an abundant number, since it is smaller than the sum of its proper divisors (33317732).

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

28613788 is a wasteful number, since it uses less digits than its factorization.

28613788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354 (or 1352 counting only the distinct ones).

The product of its digits is 129024, while the sum is 43.

The square root of 28613788 is about 5349.1857324269. The cubic root of 28613788 is about 305.8617143257.

It can be divided in two parts, 286137 and 88, that added together give a square (286225 = 535²).

The spelling of 28613788 in words is "twenty-eight million, six hundred thirteen thousand, seven hundred eighty-eight".