28757088 has 72 divisors (see below), whose sum is σ = 84442176. Its totient is φ = 9273600.

The previous prime is 28757087. The next prime is 28757101. The reversal of 28757088 is 88075782.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×28757088² = 1653940220479488, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28757083) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7318 + ... + 10538.

It is an arithmetic number, because the mean of its divisors is an integer number (1172808).

Almost surely, 2^28757088 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 28757088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42221088).

28757088 is an abundant number, since it is smaller than the sum of its proper divisors (55685088).

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

28757088 is a wasteful number, since it uses less digits than its factorization.

28757088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3268 (or 3257 counting only the distinct ones).

The product of its (nonzero) digits is 250880, while the sum is 45.

The square root of 28757088 is about 5362.5635660568. The cubic root of 28757088 is about 306.3714571416.

It can be divided in two parts, 287 and 57088, that added together give a palindrome (57375).

The spelling of 28757088 in words is "twenty-eight million, seven hundred fifty-seven thousand, eighty-eight".