28980638 has 16 divisors (see below), whose sum is σ = 44457984. Its totient is φ = 14164920.

The previous prime is 28980613. The next prime is 28980641. The reversal of 28980638 is 83608982.

It is a congruent number.

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, 17231 + ... + 18837.

It is an arithmetic number, because the mean of its divisors is an integer number (2778624).

Almost surely, 2^28980638 is an apocalyptic number.

28980638 is a deficient number, since it is larger than the sum of its proper divisors (15477346).

28980638 is a wasteful number, since it uses less digits than its factorization.

28980638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1807.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 28980638 is about 5383.3667904017. The cubic root of 28980638 is about 307.1632924053.

The spelling of 28980638 in words is "twenty-eight million, nine hundred eighty thousand, six hundred thirty-eight".