28135390 has 32 divisors (see below), whose sum is σ = 53586720. Its totient is φ = 10606464.

The previous prime is 28135381. The next prime is 28135397. The reversal of 28135390 is 9353182.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28135397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70672 + ... + 71068.

It is an arithmetic number, because the mean of its divisors is an integer number (1674585).

Almost surely, 2^28135390 is an apocalyptic number.

28135390 is a deficient number, since it is larger than the sum of its proper divisors (25451330).

28135390 is a wasteful number, since it uses less digits than its factorization.

28135390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 28135390 is about 5304.2803470405. The cubic root of 28135390 is about 304.1475435112.

The spelling of 28135390 in words is "twenty-eight million, one hundred thirty-five thousand, three hundred ninety".