28381045 has 24 divisors (see below), whose sum is σ = 43223328. Its totient is φ = 17690400.

The previous prime is 28381039. The next prime is 28381049. The reversal of 28381045 is 54018382.

It is not a de Polignac number, because 28381045 - 2¹¹ = 28378997 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28380998 and 28381016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28381049) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2571 + ... + 7960.

It is an arithmetic number, because the mean of its divisors is an integer number (1800972).

Almost surely, 2^28381045 is an apocalyptic number.

It is an amenable number.

28381045 is a deficient number, since it is larger than the sum of its proper divisors (14842283).

28381045 is a wasteful number, since it uses less digits than its factorization.

28381045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10561 (or 10554 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 28381045 is about 5327.3863197632. The cubic root of 28381045 is about 305.0301681169.

It can be divided in two parts, 2838 and 1045, that added together give a palindrome (3883).

The spelling of 28381045 in words is "twenty-eight million, three hundred eighty-one thousand, forty-five".