84637609 has 16 divisors (see below), whose sum is σ = 103265280. Its totient is φ = 67752720.

The previous prime is 84637607. The next prime is 84637633. The reversal of 84637609 is 90673648.

It is a happy number.

It is not a de Polignac number, because 84637609 - 2¹ = 84637607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84637607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4962 + ... + 13924.

It is an arithmetic number, because the mean of its divisors is an integer number (6454080).

Almost surely, 2^84637609 is an apocalyptic number.

It is an amenable number.

84637609 is a deficient number, since it is larger than the sum of its proper divisors (18627671).

84637609 is a wasteful number, since it uses less digits than its factorization.

84637609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9060.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 84637609 is about 9199.8700534301. The cubic root of 84637609 is about 439.0572255349.

The spelling of 84637609 in words is "eighty-four million, six hundred thirty-seven thousand, six hundred nine".