28488330 has 72 divisors (see below), whose sum is σ = 80248428. Its totient is φ = 7008768.

The previous prime is 28488319. The next prime is 28488337. The reversal of 28488330 is 3388482.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 4761 + 28483569 = 69^2 + 5337^2 .

It is not an unprimeable number, because it can be changed into a prime (28488337) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 14274 + ... + 16146.

Almost surely, 2^28488330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28488330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40124214).

28488330 is an abundant number, since it is smaller than the sum of its proper divisors (51760098).

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

28488330 is a wasteful number, since it uses less digits than its factorization.

28488330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1912 (or 1896 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 28488330 is about 5337.4460184624. The cubic root of 28488330 is about 305.4140394939.

The spelling of 28488330 in words is "twenty-eight million, four hundred eighty-eight thousand, three hundred thirty".