28661284 has 6 divisors (see below), whose sum is σ = 50157254. Its totient is φ = 14330640.

The previous prime is 28661257. The next prime is 28661317. The reversal of 28661284 is 48216682.

It can be written as a sum of positive squares in only one way, i.e., 26811684 + 1849600 = 5178^2 + 1360^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3582657 + ... + 3582664.

Almost surely, 2^28661284 is an apocalyptic number.

It is an amenable number.

28661284 is a deficient number, since it is larger than the sum of its proper divisors (21495970).

28661284 is a wasteful number, since it uses less digits than its factorization.

28661284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7165325 (or 7165323 counting only the distinct ones).

The product of its digits is 36864, while the sum is 37.

The square root of 28661284 is about 5353.6234458542. The cubic root of 28661284 is about 306.0308539667.

The spelling of 28661284 in words is "twenty-eight million, six hundred sixty-one thousand, two hundred eighty-four".