28181974 has 8 divisors (see below), whose sum is σ = 42647400. Its totient is φ = 13966176.

The previous prime is 28181963. The next prime is 28181977. The reversal of 28181974 is 47918182.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28181977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62124 + ... + 62575.

It is an arithmetic number, because the mean of its divisors is an integer number (5330925).

Almost surely, 2^28181974 is an apocalyptic number.

28181974 is a deficient number, since it is larger than the sum of its proper divisors (14465426).

28181974 is a wasteful number, since it uses less digits than its factorization.

28181974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124814.

The product of its digits is 32256, while the sum is 40.

The square root of 28181974 is about 5308.6697015354. The cubic root of 28181974 is about 304.3153108292.

The spelling of 28181974 in words is "twenty-eight million, one hundred eighty-one thousand, nine hundred seventy-four".