84857128 has 8 divisors (see below), whose sum is σ = 159107130. Its totient is φ = 42428560.

The previous prime is 84857119. The next prime is 84857147. The reversal of 84857128 is 82175848.

It can be written as a sum of positive squares in only one way, i.e., 82846404 + 2010724 = 9102^2 + 1418^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5303563 + ... + 5303578.

Almost surely, 2^84857128 is an apocalyptic number.

It is an amenable number.

84857128 is a deficient number, since it is larger than the sum of its proper divisors (74250002).

84857128 is a wasteful number, since it uses less digits than its factorization.

84857128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10607147 (or 10607143 counting only the distinct ones).

The product of its digits is 143360, while the sum is 43.

The square root of 84857128 is about 9211.7928765252. The cubic root of 84857128 is about 439.4364824557.

The spelling of 84857128 in words is "eighty-four million, eight hundred fifty-seven thousand, one hundred twenty-eight".