28989188 has 6 divisors (see below), whose sum is σ = 50731086. Its totient is φ = 14494592.

The previous prime is 28989157. The next prime is 28989197. The reversal of 28989188 is 88198982.

It can be written as a sum of positive squares in only one way, i.e., 28751044 + 238144 = 5362^2 + 488^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3623645 + ... + 3623652.

It is an arithmetic number, because the mean of its divisors is an integer number (8455181).

Almost surely, 2^28989188 is an apocalyptic number.

It is an amenable number.

28989188 is a deficient number, since it is larger than the sum of its proper divisors (21741898).

28989188 is a wasteful number, since it uses less digits than its factorization.

28989188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7247301 (or 7247299 counting only the distinct ones).

The product of its digits is 663552, while the sum is 53.

The square root of 28989188 is about 5384.1608445514. The cubic root of 28989188 is about 307.1934963404.

The spelling of 28989188 in words is "twenty-eight million, nine hundred eighty-nine thousand, one hundred eighty-eight".