28638672 has 40 divisors (see below), whose sum is σ = 74179776. Its totient is φ = 9520896.

The previous prime is 28638647. The next prime is 28638679. The reversal of 28638672 is 27683682.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28638679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29133 + ... + 30099.

Almost surely, 2^28638672 is an apocalyptic number.

It is an amenable number.

28638672 is an abundant number, since it is smaller than the sum of its proper divisors (45541104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28638672 is a wasteful number, since it uses less digits than its factorization.

28638672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1595 (or 1589 counting only the distinct ones).

The product of its digits is 193536, while the sum is 42.

The square root of 28638672 is about 5351.5111884401. The cubic root of 28638672 is about 305.9503529177.

The spelling of 28638672 in words is "twenty-eight million, six hundred thirty-eight thousand, six hundred seventy-two".