28481538 has 32 divisors (see below), whose sum is σ = 59304960. Its totient is φ = 9107840.

The previous prime is 28481501. The next prime is 28481539. The reversal of 28481538 is 83518482.

It is a super-2 number, since 2×28481538² = 1622396013690888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28481496 and 28481505.

It is not an unprimeable number, because it can be changed into a prime (28481539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32806 + ... + 33662.

It is an arithmetic number, because the mean of its divisors is an integer number (1853280).

Almost surely, 2^28481538 is an apocalyptic number.

28481538 is an abundant number, since it is smaller than the sum of its proper divisors (30823422).

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

28481538 is a wasteful number, since it uses less digits than its factorization.

28481538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1082.

The product of its digits is 61440, while the sum is 39.

The square root of 28481538 is about 5336.8097211724. The cubic root of 28481538 is about 305.3897659635.

The spelling of 28481538 in words is "twenty-eight million, four hundred eighty-one thousand, five hundred thirty-eight".