84278564 has 24 divisors (see below), whose sum is σ = 149988888. Its totient is φ = 41431040.

The previous prime is 84278549. The next prime is 84278587. The reversal of 84278564 is 46587248.

It can be written as a sum of positive squares in 4 ways, for example, as 409600 + 83868964 = 640^2 + 9158^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61244 + ... + 62604.

It is an arithmetic number, because the mean of its divisors is an integer number (6249537).

Almost surely, 2^84278564 is an apocalyptic number.

It is an amenable number.

84278564 is a deficient number, since it is larger than the sum of its proper divisors (65710324).

84278564 is a wasteful number, since it uses less digits than its factorization.

84278564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1615 (or 1613 counting only the distinct ones).

The product of its digits is 430080, while the sum is 44.

The square root of 84278564 is about 9180.3357237086. The cubic root of 84278564 is about 438.4354974298.

The spelling of 84278564 in words is "eighty-four million, two hundred seventy-eight thousand, five hundred sixty-four".