28055538 has 96 divisors (see below), whose sum is σ = 75841920. Its totient is φ = 7650720.

The previous prime is 28055483. The next prime is 28055539. The reversal of 28055538 is 83555082.

28055538 = T₉₂ + T₉₃ + ... + T₅₅₂.

It is a super-2 number, since 2×28055538² = 1574226424938888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28055539) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 60628 + ... + 61088.

It is an arithmetic number, because the mean of its divisors is an integer number (790020).

Almost surely, 2^28055538 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28055538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37920960).

28055538 is an abundant number, since it is smaller than the sum of its proper divisors (47786382).

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

28055538 is a wasteful number, since it uses less digits than its factorization.

28055538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509 (or 496 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

The square root of 28055538 is about 5296.7478701558. The cubic root of 28055538 is about 303.8595337326.

The spelling of 28055538 in words is "twenty-eight million, fifty-five thousand, five hundred thirty-eight".