28135408 has 60 divisors (see below), whose sum is σ = 67174272. Its totient is φ = 11343360.

The previous prime is 28135397. The next prime is 28135427. The reversal of 28135408 is 80453182.

It is a self number, because there is not a number n which added to its sum of digits gives 28135408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12273 + ... + 14383.

Almost surely, 2^28135408 is an apocalyptic number.

28135408 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28135408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33587136).

28135408 is an abundant number, since it is smaller than the sum of its proper divisors (39038864).

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

28135408 is a wasteful number, since it uses less digits than its factorization.

28135408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2150 (or 2137 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 28135408 is about 5304.2820437831. The cubic root of 28135408 is about 304.1476083720.

The spelling of 28135408 in words is "twenty-eight million, one hundred thirty-five thousand, four hundred eight".