28180784 has 10 divisors (see below), whose sum is σ = 54600300. Its totient is φ = 14090384.

The previous prime is 28180783. The next prime is 28180787. The reversal of 28180784 is 48708182.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28180783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 880634 + ... + 880665.

It is an arithmetic number, because the mean of its divisors is an integer number (5460030).

Almost surely, 2^28180784 is an apocalyptic number.

It is an amenable number.

28180784 is a deficient number, since it is larger than the sum of its proper divisors (26419516).

28180784 is a wasteful number, since it uses less digits than its factorization.

28180784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1761307 (or 1761301 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 38.

The square root of 28180784 is about 5308.5576195422. The cubic root of 28180784 is about 304.3110274728.

The spelling of 28180784 in words is "twenty-eight million, one hundred eighty thousand, seven hundred eighty-four".