28989945 has 48 divisors (see below), whose sum is σ = 52228800. Its totient is φ = 14866560.

The previous prime is 28989941. The next prime is 28989949. The reversal of 28989945 is 54998982.

It is an interprime number because it is at equal distance from previous prime (28989941) and next prime (28989949).

It is not a de Polignac number, because 28989945 - 2² = 28989941 is a prime.

It is a super-2 number, since 2×28989945² = 1680833822206050, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28989891 and 28989900.

It is not an unprimeable number, because it can be changed into a prime (28989941) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 161866 + ... + 162044.

It is an arithmetic number, because the mean of its divisors is an integer number (1088100).

Almost surely, 2^28989945 is an apocalyptic number.

It is an amenable number.

28989945 is a deficient number, since it is larger than the sum of its proper divisors (23238855).

28989945 is a wasteful number, since it uses less digits than its factorization.

28989945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310 (or 307 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The square root of 28989945 is about 5384.2311428838. The cubic root of 28989945 is about 307.1961702505.

The spelling of 28989945 in words is "twenty-eight million, nine hundred eighty-nine thousand, nine hundred forty-five".