28608330 has 64 divisors (see below), whose sum is σ = 71520768. Its totient is φ = 7318080.

The previous prime is 28608311. The next prime is 28608337. The reversal of 28608330 is 3380682.

28608330 = 2390² + 2391² + ... + 2394².

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28608337) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 86265 + ... + 86595.

It is an arithmetic number, because the mean of its divisors is an integer number (1117512).

Almost surely, 2^28608330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28608330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35760384).

28608330 is an abundant number, since it is smaller than the sum of its proper divisors (42912438).

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

28608330 is a wasteful number, since it uses less digits than its factorization.

28608330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 28608330 is about 5348.6755369904. The cubic root of 28608330 is about 305.8422656670.

The spelling of 28608330 in words is "twenty-eight million, six hundred eight thousand, three hundred thirty".