28774421 has 8 divisors (see below), whose sum is σ = 32810904. Its totient is φ = 24998400.

The previous prime is 28774399. The next prime is 28774441. The reversal of 28774421 is 12447782.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1473796 + 27300625 = 1214^2 + 5225^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28774421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28774441) by changing a digit.

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, 64880 + ... + 65321.

It is an arithmetic number, because the mean of its divisors is an integer number (4101363).

Almost surely, 2^28774421 is an apocalyptic number.

It is an amenable number.

28774421 is a deficient number, since it is larger than the sum of its proper divisors (4036483).

28774421 is a wasteful number, since it uses less digits than its factorization.

28774421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130231.

The product of its digits is 25088, while the sum is 35.

The square root of 28774421 is about 5364.1794339862. The cubic root of 28774421 is about 306.4329987218.

The spelling of 28774421 in words is "twenty-eight million, seven hundred seventy-four thousand, four hundred twenty-one".