84909687 has 4 divisors (see below), whose sum is σ = 113212920. Its totient is φ = 56606456.

The previous prime is 84909677. The next prime is 84909697. The reversal of 84909687 is 78690948.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (84909677) and next prime (84909697).

It is a cyclic number.

It is not a de Polignac number, because 84909687 - 2⁸ = 84909431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84909607) 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, 14151612 + ... + 14151617.

It is an arithmetic number, because the mean of its divisors is an integer number (28303230).

Almost surely, 2^84909687 is an apocalyptic number.

84909687 is a deficient number, since it is larger than the sum of its proper divisors (28303233).

84909687 is a wasteful number, since it uses less digits than its factorization.

84909687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28303232.

The product of its (nonzero) digits is 870912, while the sum is 51.

The square root of 84909687 is about 9214.6452454774. The cubic root of 84909687 is about 439.5271901184.

The spelling of 84909687 in words is "eighty-four million, nine hundred nine thousand, six hundred eighty-seven".