28609011 has 32 divisors (see below), whose sum is σ = 45276480. Its totient is φ = 17791488.

The previous prime is 28608991. The next prime is 28609013. The reversal of 28609011 is 11090682.

It is not a de Polignac number, because 28609011 - 2⁷ = 28608883 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (28609013) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71865 + ... + 72261.

It is an arithmetic number, because the mean of its divisors is an integer number (1414890).

Almost surely, 2^28609011 is an apocalyptic number.

28609011 is a deficient number, since it is larger than the sum of its proper divisors (16667469).

28609011 is a wasteful number, since it uses less digits than its factorization.

28609011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580 (or 574 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 28609011 is about 5348.7391972314. The cubic root of 28609011 is about 305.8446924302.

Adding to 28609011 its reverse (11090682), we get a palindrome (39699693).

The spelling of 28609011 in words is "twenty-eight million, six hundred nine thousand, eleven".