28180790 has 16 divisors (see below), whose sum is σ = 55337040. Its totient is φ = 10247520.

The previous prime is 28180787. The next prime is 28180807. The reversal of 28180790 is 9708182.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28180790.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127985 + ... + 128204.

It is an arithmetic number, because the mean of its divisors is an integer number (3458565).

Almost surely, 2^28180790 is an apocalyptic number.

28180790 is a deficient number, since it is larger than the sum of its proper divisors (27156250).

28180790 is a wasteful number, since it uses less digits than its factorization.

28180790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256207.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 28180790 is about 5308.5581846675. The cubic root of 28180790 is about 304.3110490698.

The spelling of 28180790 in words is "twenty-eight million, one hundred eighty thousand, seven hundred ninety".