28440628 has 6 divisors (see below), whose sum is σ = 49771106. Its totient is φ = 14220312.

The previous prime is 28440617. The next prime is 28440641. The reversal of 28440628 is 82604482.

It can be written as a sum of positive squares in only one way, i.e., 28430224 + 10404 = 5332^2 + 102^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28440593 and 28440602.

It is a congruent number.

It is an unprimeable number.

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, 3555075 + ... + 3555082.

Almost surely, 2^28440628 is an apocalyptic number.

It is an amenable number.

28440628 is a deficient number, since it is larger than the sum of its proper divisors (21330478).

28440628 is a wasteful number, since it uses less digits than its factorization.

28440628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7110161 (or 7110159 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 34.

The square root of 28440628 is about 5332.9755296645. The cubic root of 28440628 is about 305.2434784297.

The spelling of 28440628 in words is "twenty-eight million, four hundred forty thousand, six hundred twenty-eight".