28146724 has 6 divisors (see below), whose sum is σ = 49256774. Its totient is φ = 14073360.

The previous prime is 28146721. The next prime is 28146731. The reversal of 28146724 is 42764182.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 27878400 + 268324 = 5280^2 + 518^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28146724.

It is not an unprimeable number, because it can be changed into a prime (28146721) 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 as a sum of consecutive naturals, namely, 3518337 + ... + 3518344.

Almost surely, 2^28146724 is an apocalyptic number.

It is an amenable number.

28146724 is a deficient number, since it is larger than the sum of its proper divisors (21110050).

28146724 is a wasteful number, since it uses less digits than its factorization.

28146724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7036685 (or 7036683 counting only the distinct ones).

The product of its digits is 21504, while the sum is 34.

The square root of 28146724 is about 5305.3486219098. The cubic root of 28146724 is about 304.1883787424.

The spelling of 28146724 in words is "twenty-eight million, one hundred forty-six thousand, seven hundred twenty-four".