28732688 has 10 divisors (see below), whose sum is σ = 55669614. Its totient is φ = 14366336.

The previous prime is 28732687. The next prime is 28732699. The reversal of 28732688 is 88623782.

It can be written as a sum of positive squares in only one way, i.e., 27583504 + 1149184 = 5252^2 + 1072^2 .

It is not an unprimeable number, because it can be changed into a prime (28732687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 897881 + ... + 897912.

Almost surely, 2^28732688 is an apocalyptic number.

It is an amenable number.

28732688 is a deficient number, since it is larger than the sum of its proper divisors (26936926).

28732688 is a wasteful number, since it uses less digits than its factorization.

28732688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795801 (or 1795795 counting only the distinct ones).

The product of its digits is 258048, while the sum is 44.

The square root of 28732688 is about 5360.2880519614. The cubic root of 28732688 is about 306.2847819443.

The spelling of 28732688 in words is "twenty-eight million, seven hundred thirty-two thousand, six hundred eighty-eight".