28989961 has 16 divisors (see below), whose sum is σ = 38924928. Its totient is φ = 20851200.

The previous prime is 28989949. The next prime is 28989971. The reversal of 28989961 is 16998982.

It is a cyclic number.

It is not a de Polignac number, because 28989961 - 2¹¹ = 28987913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28989899 and 28989908.

It is not an unprimeable number, because it can be changed into a prime (28989901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13480 + ... + 15481.

It is an arithmetic number, because the mean of its divisors is an integer number (2432808).

Almost surely, 2^28989961 is an apocalyptic number.

It is an amenable number.

28989961 is a deficient number, since it is larger than the sum of its proper divisors (9934967).

28989961 is a wasteful number, since it uses less digits than its factorization.

28989961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28992.

The product of its digits is 559872, while the sum is 52.

The square root of 28989961 is about 5384.2326287039. The cubic root of 28989961 is about 307.1962267659.

It can be divided in two parts, 28 and 989961, that added together give a palindrome (989989).

The spelling of 28989961 in words is "twenty-eight million, nine hundred eighty-nine thousand, nine hundred sixty-one".