28642311 has 6 divisors (see below), whose sum is σ = 41372240. Its totient is φ = 19094868.

The previous prime is 28642309. The next prime is 28642321. The reversal of 28642311 is 11324682.

28642311 is a `hidden beast` number, since 2 + 8 + 642 + 3 + 11 = 666.

It is not a de Polignac number, because 28642311 - 2¹ = 28642309 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 (28642301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1591231 + ... + 1591248.

Almost surely, 2^28642311 is an apocalyptic number.

28642311 is a deficient number, since it is larger than the sum of its proper divisors (12729929).

28642311 is a wasteful number, since it uses less digits than its factorization.

28642311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3182485 (or 3182482 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 28642311 is about 5351.8511750608. The cubic root of 28642311 is about 305.9633109927.

Adding to 28642311 its reverse (11324682), we get a palindrome (39966993).

The spelling of 28642311 in words is "twenty-eight million, six hundred forty-two thousand, three hundred eleven".