28636628 has 6 divisors (see below), whose sum is σ = 50114106. Its totient is φ = 14318312.

The previous prime is 28636627. The next prime is 28636639. The reversal of 28636628 is 82663682.

It can be written as a sum of positive squares in only one way, i.e., 14961424 + 13675204 = 3868^2 + 3698^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28636627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3579575 + ... + 3579582.

It is an arithmetic number, because the mean of its divisors is an integer number (8352351).

Almost surely, 2^28636628 is an apocalyptic number.

It is an amenable number.

28636628 is a deficient number, since it is larger than the sum of its proper divisors (21477478).

28636628 is a wasteful number, since it uses less digits than its factorization.

28636628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7159161 (or 7159159 counting only the distinct ones).

The product of its digits is 165888, while the sum is 41.

The square root of 28636628 is about 5351.3202109386. The cubic root of 28636628 is about 305.9430739792.

The spelling of 28636628 in words is "twenty-eight million, six hundred thirty-six thousand, six hundred twenty-eight".