28850989 has 8 divisors (see below), whose sum is σ = 30614328. Its totient is φ = 27095040.

The previous prime is 28850977. The next prime is 28850999. The reversal of 28850989 is 98905882.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16670889 + 12180100 = 4083^2 + 3490^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28850989 - 2⁵ = 28850957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28850909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7629 + ... + 10765.

It is an arithmetic number, because the mean of its divisors is an integer number (3826791).

Almost surely, 2^28850989 is an apocalyptic number.

It is an amenable number.

28850989 is a deficient number, since it is larger than the sum of its proper divisors (1763339).

28850989 is a wasteful number, since it uses less digits than its factorization.

28850989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3695.

The product of its (nonzero) digits is 414720, while the sum is 49.

The square root of 28850989 is about 5371.3116647612. The cubic root of 28850989 is about 306.7045614535.

The spelling of 28850989 in words is "twenty-eight million, eight hundred fifty thousand, nine hundred eighty-nine".