28838540 has 24 divisors (see below), whose sum is σ = 62199312. Its totient is φ = 11223360.

The previous prime is 28838531. The next prime is 28838569. The reversal of 28838540 is 4583882.

It is a super-2 number, since 2×28838540² = 1663322778663200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28838494 and 28838503.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18746 + ... + 20225.

It is an arithmetic number, because the mean of its divisors is an integer number (2591638).

Almost surely, 2^28838540 is an apocalyptic number.

28838540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28838540 is an abundant number, since it is smaller than the sum of its proper divisors (33360772).

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

28838540 is a wasteful number, since it uses less digits than its factorization.

28838540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39017 (or 39015 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 38.

The square root of 28838540 is about 5370.1526980152. The cubic root of 28838540 is about 306.6604414825.

The spelling of 28838540 in words is "twenty-eight million, eight hundred thirty-eight thousand, five hundred forty".