28037945 has 12 divisors (see below), whose sum is σ = 36433836. Its totient is φ = 20704320.

The previous prime is 28037923. The next prime is 28037951. The reversal of 28037945 is 54973082.

It can be written as a sum of positive squares in 6 ways, for example, as 6285049 + 21752896 = 2507^2 + 4664^2 .

It is not a de Polignac number, because 28037945 - 2⁶ = 28037881 is a prime.

It is a super-2 number, since 2×28037945² = 1572252719646050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28037899 and 28037908.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15746 + ... + 17435.

It is an arithmetic number, because the mean of its divisors is an integer number (3036153).

Almost surely, 2^28037945 is an apocalyptic number.

It is an amenable number.

28037945 is a deficient number, since it is larger than the sum of its proper divisors (8395891).

28037945 is a wasteful number, since it uses less digits than its factorization.

28037945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33212 (or 33199 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 28037945 is about 5295.0868736972. The cubic root of 28037945 is about 303.7960059474.

It can be divided in two parts, 28037 and 945, that added together give a palindrome (28982).

The spelling of 28037945 in words is "twenty-eight million, thirty-seven thousand, nine hundred forty-five".