28638859452 has 24 divisors (see below), whose sum is σ = 76370292096. Its totient is φ = 8182531248.

The previous prime is 28638859427. The next prime is 28638859453. The reversal of 28638859452 is 25495883682.

It is a happy number.

It is a super-2 number, since 2×28638859452² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28638859453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170469318 + ... + 170469485.

It is an arithmetic number, because the mean of its divisors is an integer number (3182095504).

Almost surely, 2^28638859452 is an apocalyptic number.

It is an amenable number.

28638859452 is an abundant number, since it is smaller than the sum of its proper divisors (47731432644).

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

28638859452 is a wasteful number, since it uses less digits than its factorization.

28638859452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340938817 (or 340938815 counting only the distinct ones).

The product of its digits is 33177600, while the sum is 60.

The spelling of 28638859452 in words is "twenty-eight billion, six hundred thirty-eight million, eight hundred fifty-nine thousand, four hundred fifty-two".