28773447 has 8 divisors (see below), whose sum is σ = 39181056. Its totient is φ = 18774072.

The previous prime is 28773443. The next prime is 28773473. The reversal of 28773447 is 74437782.

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

It is not a de Polignac number, because 28773447 - 2² = 28773443 is a prime.

It is a super-2 number, since 2×28773447² = 1655822504523618, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28773399 and 28773408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28773443) 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 7 ways as a sum of consecutive naturals, for example, 101893 + ... + 102174.

It is an arithmetic number, because the mean of its divisors is an integer number (4897632).

Almost surely, 2^28773447 is an apocalyptic number.

28773447 is a deficient number, since it is larger than the sum of its proper divisors (10407609).

28773447 is a wasteful number, since it uses less digits than its factorization.

28773447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204117.

The product of its digits is 263424, while the sum is 42.

The square root of 28773447 is about 5364.0886458000. The cubic root of 28773447 is about 306.4295411473.

The spelling of 28773447 in words is "twenty-eight million, seven hundred seventy-three thousand, four hundred forty-seven".