28266631 has 8 divisors (see below), whose sum is σ = 30738960. Its totient is φ = 25884288.

The previous prime is 28266629. The next prime is 28266647. The reversal of 28266631 is 13666282.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28266631 - 2¹ = 28266629 is a prime.

It is a super-2 number, since 2×28266631² = 1598004856180322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28266691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21841 + ... + 23098.

It is an arithmetic number, because the mean of its divisors is an integer number (3842370).

Almost surely, 2^28266631 is an apocalyptic number.

28266631 is a deficient number, since it is larger than the sum of its proper divisors (2472329).

28266631 is a wasteful number, since it uses less digits than its factorization.

28266631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44993.

The product of its digits is 20736, while the sum is 34.

The square root of 28266631 is about 5316.6371890510. The cubic root of 28266631 is about 304.6197213478.

The spelling of 28266631 in words is "twenty-eight million, two hundred sixty-six thousand, six hundred thirty-one".