28229477 has 4 divisors (see below), whose sum is σ = 28245420. Its totient is φ = 28213536.

The previous prime is 28229471. The next prime is 28229501. The reversal of 28229477 is 77492282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24661156 + 3568321 = 4966^2 + 1889^2 .

It is a cyclic number.

It is not a de Polignac number, because 28229477 - 2⁶ = 28229413 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 (28229471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4928 + ... + 8985.

It is an arithmetic number, because the mean of its divisors is an integer number (7061355).

Almost surely, 2^28229477 is an apocalyptic number.

It is an amenable number.

28229477 is a deficient number, since it is larger than the sum of its proper divisors (15943).

28229477 is a wasteful number, since it uses less digits than its factorization.

28229477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15942.

The product of its digits is 112896, while the sum is 41.

The square root of 28229477 is about 5313.1419141596. The cubic root of 28229477 is about 304.4861975529.

The spelling of 28229477 in words is "twenty-eight million, two hundred twenty-nine thousand, four hundred seventy-seven".