28638558 has 24 divisors (see below), whose sum is σ = 66823848. Its totient is φ = 8811792.

The previous prime is 28638553. The next prime is 28638563. The reversal of 28638558 is 85583682.

It is a happy number.

28638558 is a `hidden beast` number, since 2 + 8 + 638 + 5 + 5 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (28638553) and next prime (28638563).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28638553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60960 + ... + 61427.

It is an arithmetic number, because the mean of its divisors is an integer number (2784327).

Almost surely, 2^28638558 is an apocalyptic number.

28638558 is an abundant number, since it is smaller than the sum of its proper divisors (38185290).

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

28638558 is a wasteful number, since it uses less digits than its factorization.

28638558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122408 (or 122405 counting only the distinct ones).

The product of its digits is 460800, while the sum is 45.

The square root of 28638558 is about 5351.5005372325. The cubic root of 28638558 is about 305.9499469586.

The spelling of 28638558 in words is "twenty-eight million, six hundred thirty-eight thousand, five hundred fifty-eight".