28632561 has 32 divisors (see below), whose sum is σ = 41499648. Its totient is φ = 17521920.

The previous prime is 28632559. The next prime is 28632577. The reversal of 28632561 is 16523682.

It is not a de Polignac number, because 28632561 - 2¹ = 28632559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28632521) 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, 182295 + ... + 182451.

It is an arithmetic number, because the mean of its divisors is an integer number (1296864).

Almost surely, 2^28632561 is an apocalyptic number.

It is an amenable number.

28632561 is a deficient number, since it is larger than the sum of its proper divisors (12867087).

28632561 is a wasteful number, since it uses less digits than its factorization.

28632561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281.

The product of its digits is 17280, while the sum is 33.

The square root of 28632561 is about 5350.9401977596. The cubic root of 28632561 is about 305.9285898554.

The spelling of 28632561 in words is "twenty-eight million, six hundred thirty-two thousand, five hundred sixty-one".