84723609 has 16 divisors (see below), whose sum is σ = 114250752. Its totient is φ = 55843728.

The previous prime is 84723557. The next prime is 84723619. The reversal of 84723609 is 90632748.

It is not a de Polignac number, because 84723609 - 2¹⁷ = 84592537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84723619) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 131442 + ... + 132084.

It is an arithmetic number, because the mean of its divisors is an integer number (7140672).

Almost surely, 2^84723609 is an apocalyptic number.

It is an amenable number.

84723609 is a deficient number, since it is larger than the sum of its proper divisors (29527143).

84723609 is a wasteful number, since it uses less digits than its factorization.

84723609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 84723609 is about 9204.5428457909. The cubic root of 84723609 is about 439.2058834037.

The spelling of 84723609 in words is "eighty-four million, seven hundred twenty-three thousand, six hundred nine".