28355072 has 20 divisors (see below), whose sum is σ = 56655786. Its totient is φ = 14177280.

The previous prime is 28355071. The next prime is 28355077. The reversal of 28355072 is 27055382.

It can be written as a sum of positive squares in only one way, i.e., 17172736 + 11182336 = 4144^2 + 3344^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (28355071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27179 + ... + 28202.

Almost surely, 2^28355072 is an apocalyptic number.

It is an amenable number.

28355072 is a deficient number, since it is larger than the sum of its proper divisors (28300714).

28355072 is an frugal number, since it uses more digits than its factorization.

28355072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55399 (or 55383 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 28355072 is about 5324.9480748642. The cubic root of 28355072 is about 304.9370899542.

It can be divided in two parts, 283 and 55072, that added together give a palindrome (55355).

The spelling of 28355072 in words is "twenty-eight million, three hundred fifty-five thousand, seventy-two".