28578258 has 56 divisors (see below), whose sum is σ = 68111388. Its totient is φ = 8957952.

The previous prime is 28578257. The next prime is 28578269. The reversal of 28578258 is 85287582.

28578258 is a `hidden beast` number, since 28 + 578 + 2 + 58 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 26040609 + 2537649 = 5103^2 + 1593^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28578257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 24210 + ... + 25362.

Almost surely, 2^28578258 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28578258, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34055694).

28578258 is an abundant number, since it is smaller than the sum of its proper divisors (39533130).

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

28578258 is a wasteful number, since it uses less digits than its factorization.

28578258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1190 (or 1175 counting only the distinct ones).

The product of its digits is 358400, while the sum is 45.

The square root of 28578258 is about 5345.8636346244. The cubic root of 28578258 is about 305.7350648026.

The spelling of 28578258 in words is "twenty-eight million, five hundred seventy-eight thousand, two hundred fifty-eight".