28721596 has 6 divisors (see below), whose sum is σ = 50262800. Its totient is φ = 14360796.

The previous prime is 28721587. The next prime is 28721599. The reversal of 28721596 is 69512782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28721599) 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, 3590196 + ... + 3590203.

Almost surely, 2^28721596 is an apocalyptic number.

It is an amenable number.

28721596 is a deficient number, since it is larger than the sum of its proper divisors (21541204).

28721596 is a wasteful number, since it uses less digits than its factorization.

28721596 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7180403 (or 7180401 counting only the distinct ones).

The product of its digits is 60480, while the sum is 40.

The square root of 28721596 is about 5359.2533061985. The cubic root of 28721596 is about 306.2453640281.

The spelling of 28721596 in words is "twenty-eight million, seven hundred twenty-one thousand, five hundred ninety-six".