28971018 has 12 divisors (see below), whose sum is σ = 62770578. Its totient is φ = 9657000.

The previous prime is 28970989. The next prime is 28971049. The reversal of 28971018 is 81017982.

It can be written as a sum of positive squares in only one way, i.e., 23648769 + 5322249 = 4863^2 + 2307^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 804733 + ... + 804768.

Almost surely, 2^28971018 is an apocalyptic number.

28971018 is an abundant number, since it is smaller than the sum of its proper divisors (33799560).

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

28971018 is a wasteful number, since it uses less digits than its factorization.

28971018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1609509 (or 1609506 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 28971018 is about 5382.4732233426. The cubic root of 28971018 is about 307.1293014595.

The spelling of 28971018 in words is "twenty-eight million, nine hundred seventy-one thousand, eighteen".