28950009 has 16 divisors (see below), whose sum is σ = 42586560. Its totient is φ = 17346560.

The previous prime is 28950007. The next prime is 28950013. The reversal of 28950009 is 90005982.

It is not a de Polignac number, because 28950009 - 2¹ = 28950007 is a prime.

It is a super-2 number, since 2×28950009² = 1676206042200162, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (28950007) 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, 1992 + ... + 7865.

It is an arithmetic number, because the mean of its divisors is an integer number (2661660).

Almost surely, 2^28950009 is an apocalyptic number.

It is an amenable number.

28950009 is a deficient number, since it is larger than the sum of its proper divisors (13636551).

28950009 is a wasteful number, since it uses less digits than its factorization.

28950009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9960.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 28950009 is about 5380.5212572761. The cubic root of 28950009 is about 307.0550428810.

The spelling of 28950009 in words is "twenty-eight million, nine hundred fifty thousand, nine".