28450989 has 24 divisors (see below), whose sum is σ = 47541312. Its totient is φ = 16058880.

The previous prime is 28450957. The next prime is 28450997. The reversal of 28450989 is 98905482.

It is not a de Polignac number, because 28450989 - 2⁵ = 28450957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28450909) 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, 2509 + ... + 7949.

It is an arithmetic number, because the mean of its divisors is an integer number (1980888).

Almost surely, 2^28450989 is an apocalyptic number.

It is an amenable number.

28450989 is a deficient number, since it is larger than the sum of its proper divisors (19090323).

28450989 is a wasteful number, since it uses less digits than its factorization.

28450989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5537 (or 5534 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 28450989 is about 5333.9468501289. The cubic root of 28450989 is about 305.2805409459.

The spelling of 28450989 in words is "twenty-eight million, four hundred fifty thousand, nine hundred eighty-nine".