28847642 has 16 divisors (see below), whose sum is σ = 44608200. Its totient is φ = 13981248.

The previous prime is 28847627. The next prime is 28847677. The reversal of 28847642 is 24674882.

It is a Cunningham number, because it is equal to 5371²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 25816561 + 3031081 = 5081^2 + 1741^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28847642.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25268 + ... + 26384.

Almost surely, 2^28847642 is an apocalyptic number.

28847642 is a deficient number, since it is larger than the sum of its proper divisors (15760558).

28847642 is a wasteful number, since it uses less digits than its factorization.

28847642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1505.

The product of its digits is 172032, while the sum is 41.

The square root of 28847642 is about 5371.0000930925. Note that the first 4 decimals coincide. The cubic root of 28847642 is about 306.6927007409.

The spelling of 28847642 in words is "twenty-eight million, eight hundred forty-seven thousand, six hundred forty-two".