28777248 has 96 divisors (see below), whose sum is σ = 88401600. Its totient is φ = 9082368.

The previous prime is 28777247. The next prime is 28777249. The reversal of 28777248 is 84277782.

It is an interprime number because it is at equal distance from previous prime (28777247) and next prime (28777249).

It is a tau number, because it is divible by the number of its divisors (96).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28777241) 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, 15540 + ... + 17292.

It is an arithmetic number, because the mean of its divisors is an integer number (920850).

Almost surely, 2^28777248 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 28777248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44200800).

28777248 is an abundant number, since it is smaller than the sum of its proper divisors (59624352).

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

28777248 is a wasteful number, since it uses less digits than its factorization.

28777248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791 (or 1777 counting only the distinct ones).

The product of its digits is 351232, while the sum is 45.

The square root of 28777248 is about 5364.4429347324. The cubic root of 28777248 is about 306.4430337655.

The spelling of 28777248 in words is "twenty-eight million, seven hundred seventy-seven thousand, two hundred forty-eight".