28428688 has 10 divisors (see below), whose sum is σ = 55080614. Its totient is φ = 14214336.

The previous prime is 28428683. The next prime is 28428689. The reversal of 28428688 is 88682482.

It can be written as a sum of positive squares in only one way, i.e., 14500864 + 13927824 = 3808^2 + 3732^2 .

It is not an unprimeable number, because it can be changed into a prime (28428683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 888381 + ... + 888412.

Almost surely, 2^28428688 is an apocalyptic number.

It is an amenable number.

28428688 is a deficient number, since it is larger than the sum of its proper divisors (26651926).

28428688 is a wasteful number, since it uses less digits than its factorization.

28428688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1776801 (or 1776795 counting only the distinct ones).

The product of its digits is 393216, while the sum is 46.

The square root of 28428688 is about 5331.8559620455. The cubic root of 28428688 is about 305.2007564795.

The spelling of 28428688 in words is "twenty-eight million, four hundred twenty-eight thousand, six hundred eighty-eight".