84709478631 has 4 divisors (see below), whose sum is σ = 112945971512. Its totient is φ = 56472985752.

The previous prime is 84709478621. The next prime is 84709478671. The reversal of 84709478631 is 13687490748.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 84709478631 - 2¹⁷ = 84709347559 is a prime.

It is a super-2 number, since 2×84709478631² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84709478621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14118246436 + ... + 14118246441.

It is an arithmetic number, because the mean of its divisors is an integer number (28236492878).

Almost surely, 2^84709478631 is an apocalyptic number.

84709478631 is a deficient number, since it is larger than the sum of its proper divisors (28236492881).

84709478631 is a wasteful number, since it uses less digits than its factorization.

84709478631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28236492880.

The product of its (nonzero) digits is 8128512, while the sum is 57.

The spelling of 84709478631 in words is "eighty-four billion, seven hundred nine million, four hundred seventy-eight thousand, six hundred thirty-one".