84748009 has 4 divisors (see below), whose sum is σ = 89733204. Its totient is φ = 79762816.

The previous prime is 84747997. The next prime is 84748039. The reversal of 84748009 is 90084748.

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

It can be written as a sum of positive squares in 2 ways, for example, as 31866025 + 52881984 = 5645^2 + 7272^2 .

It is a cyclic number.

It is not a de Polignac number, because 84748009 - 2⁷ = 84747881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84748039) 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 3 ways as a sum of consecutive naturals, for example, 2492572 + ... + 2492605.

It is an arithmetic number, because the mean of its divisors is an integer number (22433301).

Almost surely, 2^84748009 is an apocalyptic number.

It is an amenable number.

84748009 is a deficient number, since it is larger than the sum of its proper divisors (4985195).

84748009 is a wasteful number, since it uses less digits than its factorization.

84748009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4985194.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 84748009 is about 9205.8681828495. The cubic root of 84748009 is about 439.2480424314.

The spelling of 84748009 in words is "eighty-four million, seven hundred forty-eight thousand, nine".