84678531 has 16 divisors (see below), whose sum is σ = 130023168. Its totient is φ = 48016800.

The previous prime is 84678499. The next prime is 84678563. The reversal of 84678531 is 13587648.

It is an interprime number because it is at equal distance from previous prime (84678499) and next prime (84678563).

It is not a de Polignac number, because 84678531 - 2⁵ = 84678499 is a prime.

It is a super-2 number, since 2×84678531² = 14340907224635922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (84678031) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 12640 + ... + 18141.

It is an arithmetic number, because the mean of its divisors is an integer number (8126448).

Almost surely, 2^84678531 is an apocalyptic number.

84678531 is a deficient number, since it is larger than the sum of its proper divisors (45344637).

84678531 is a wasteful number, since it uses less digits than its factorization.

84678531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30922.

The product of its digits is 161280, while the sum is 42.

The square root of 84678531 is about 9202.0938378176. The cubic root of 84678531 is about 439.1279750323.

The spelling of 84678531 in words is "eighty-four million, six hundred seventy-eight thousand, five hundred thirty-one".