28779445 has 8 divisors (see below), whose sum is σ = 34877880. Its totient is φ = 22795200.

The previous prime is 28779431. The next prime is 28779449. The reversal of 28779445 is 54497782.

It can be written as a sum of positive squares in 4 ways, for example, as 15689521 + 13089924 = 3961^2 + 3618^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-28779445 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28779395 and 28779404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28779449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27990 + ... + 28999.

It is an arithmetic number, because the mean of its divisors is an integer number (4359735).

Almost surely, 2^28779445 is an apocalyptic number.

It is an amenable number.

28779445 is a deficient number, since it is larger than the sum of its proper divisors (6098435).

28779445 is a wasteful number, since it uses less digits than its factorization.

28779445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57095.

The product of its digits is 564480, while the sum is 46.

The square root of 28779445 is about 5364.6477051154. The cubic root of 28779445 is about 306.4508320351.

The spelling of 28779445 in words is "twenty-eight million, seven hundred seventy-nine thousand, four hundred forty-five".