28771488 has 36 divisors (see below), whose sum is σ = 81819738. Its totient is φ = 9590400.

The previous prime is 28771481. The next prime is 28771489. The reversal of 28771488 is 88417782.

It can be written as a sum of positive squares in only one way, i.e., 16744464 + 12027024 = 4092^2 + 3468^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (28771481) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49663 + ... + 50238.

Almost surely, 2^28771488 is an apocalyptic number.

It is an amenable number.

28771488 is an abundant number, since it is smaller than the sum of its proper divisors (53048250).

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

28771488 is a wasteful number, since it uses less digits than its factorization.

28771488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99917 (or 99906 counting only the distinct ones).

The product of its digits is 200704, while the sum is 45.

The square root of 28771488 is about 5363.9060394455. The cubic root of 28771488 is about 306.4225867135.

The spelling of 28771488 in words is "twenty-eight million, seven hundred seventy-one thousand, four hundred eighty-eight".