28020628 has 12 divisors (see below), whose sum is σ = 49089460. Its totient is φ = 13995072.

The previous prime is 28020613. The next prime is 28020631. The reversal of 28020628 is 82602082.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11276164 + 16744464 = 3358^2 + 4092^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28020596 and 28020605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1000 + ... + 7552.

Almost surely, 2^28020628 is an apocalyptic number.

It is an amenable number.

28020628 is a deficient number, since it is larger than the sum of its proper divisors (21068832).

28020628 is a wasteful number, since it uses less digits than its factorization.

28020628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7626 (or 7624 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 28020628 is about 5293.4514260546. The cubic root of 28020628 is about 303.7334488320.

The spelling of 28020628 in words is "twenty-eight million, twenty thousand, six hundred twenty-eight".