28632861 has 12 divisors (see below), whose sum is σ = 43157088. Its totient is φ = 18258504.

The previous prime is 28632859. The next prime is 28632893. The reversal of 28632861 is 16823682.

It is not a de Polignac number, because 28632861 - 2¹ = 28632859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28632841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68955 + ... + 69368.

It is an arithmetic number, because the mean of its divisors is an integer number (3596424).

Almost surely, 2^28632861 is an apocalyptic number.

It is an amenable number.

28632861 is a deficient number, since it is larger than the sum of its proper divisors (14524227).

28632861 is a wasteful number, since it uses less digits than its factorization.

28632861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138352 (or 138349 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 28632861 is about 5350.9682301430. The cubic root of 28632861 is about 305.9296583156.

The spelling of 28632861 in words is "twenty-eight million, six hundred thirty-two thousand, eight hundred sixty-one".