84256709 has 8 divisors (see below), whose sum is σ = 89731800. Its totient is φ = 78839296.

The previous prime is 84256699. The next prime is 84256717. The reversal of 84256709 is 90765248.

It can be written as a sum of positive squares in 4 ways, for example, as 39967684 + 44289025 = 6322^2 + 6655^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 84256709 - 2⁴ = 84256693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84256789) 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 7 ways as a sum of consecutive naturals, for example, 11384 + ... + 17265.

It is an arithmetic number, because the mean of its divisors is an integer number (11216475).

Almost surely, 2^84256709 is an apocalyptic number.

It is an amenable number.

84256709 is a deficient number, since it is larger than the sum of its proper divisors (5475091).

84256709 is a wasteful number, since it uses less digits than its factorization.

84256709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28839.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 84256709 is about 9179.1453305850. The cubic root of 84256709 is about 438.3975959923.

The spelling of 84256709 in words is "eighty-four million, two hundred fifty-six thousand, seven hundred nine".