28638002 has 8 divisors (see below), whose sum is σ = 42994476. Its totient is φ = 14306512.

The previous prime is 28637981. The next prime is 28638007. The reversal of 28638002 is 20083682.

It can be written as a sum of positive squares in 2 ways, for example, as 27363361 + 1274641 = 5231^2 + 1129^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (28638007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3053 + ... + 8160.

Almost surely, 2^28638002 is an apocalyptic number.

28638002 is a deficient number, since it is larger than the sum of its proper divisors (14356474).

28638002 is a wasteful number, since it uses less digits than its factorization.

28638002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12492.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 28638002 is about 5351.4485889337. The cubic root of 28638002 is about 305.9479670024.

The spelling of 28638002 in words is "twenty-eight million, six hundred thirty-eight thousand, two".