28733445 has 24 divisors (see below), whose sum is σ = 53636856. Its totient is φ = 14145408.

The previous prime is 28733443. The next prime is 28733479. The reversal of 28733445 is 54433782.

It is a happy number.

28733445 is a `hidden beast` number, since 287 + 334 + 45 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3663396 + 25070049 = 1914^2 + 5007^2 .

It is not a de Polignac number, because 28733445 - 2¹ = 28733443 is a prime.

It is a super-2 number, since 2×28733445² = 1651221723136050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28733443) 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 23 ways as a sum of consecutive naturals, for example, 23974 + ... + 25143.

It is an arithmetic number, because the mean of its divisors is an integer number (2234869).

Almost surely, 2^28733445 is an apocalyptic number.

It is an amenable number.

28733445 is a deficient number, since it is larger than the sum of its proper divisors (24903411).

28733445 is a wasteful number, since it uses less digits than its factorization.

28733445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49141 (or 49138 counting only the distinct ones).

The product of its digits is 80640, while the sum is 36.

The square root of 28733445 is about 5360.3586633732. The cubic root of 28733445 is about 306.2874717442.

The spelling of 28733445 in words is "twenty-eight million, seven hundred thirty-three thousand, four hundred forty-five".