28608631 has 8 divisors (see below), whose sum is σ = 29353104. Its totient is φ = 27867840.

The previous prime is 28608607. The next prime is 28608641. The reversal of 28608631 is 13680682.

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 28608631 - 2⁵ = 28608599 is a prime.

It is a super-2 number, since 2×28608631² = 1636907535388322, 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 (28608641) 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, 21765 + ... + 23041.

It is an arithmetic number, because the mean of its divisors is an integer number (3669138).

Almost surely, 2^28608631 is an apocalyptic number.

28608631 is a deficient number, since it is larger than the sum of its proper divisors (744473).

28608631 is a wasteful number, since it uses less digits than its factorization.

28608631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 28608631 is about 5348.7036747234. The cubic root of 28608631 is about 305.8433382939.

The spelling of 28608631 in words is "twenty-eight million, six hundred eight thousand, six hundred thirty-one".