28731608 has 8 divisors (see below), whose sum is σ = 53871780. Its totient is φ = 14365800.

The previous prime is 28731601. The next prime is 28731631. The reversal of 28731608 is 80613782.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28731601) 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 as a sum of consecutive naturals, namely, 1795718 + ... + 1795733.

Almost surely, 2^28731608 is an apocalyptic number.

It is an amenable number.

28731608 is a deficient number, since it is larger than the sum of its proper divisors (25140172).

28731608 is a wasteful number, since it uses less digits than its factorization.

28731608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3591457 (or 3591453 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 28731608 is about 5360.1873101600. The cubic root of 28731608 is about 306.2809443673.

The spelling of 28731608 in words is "twenty-eight million, seven hundred thirty-one thousand, six hundred eight".