84644387 has 4 divisors (see below), whose sum is σ = 84725976. Its totient is φ = 84562800.

The previous prime is 84644369. The next prime is 84644401. The reversal of 84644387 is 78344648.

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

It is a cyclic number.

It is not a de Polignac number, because 84644387 - 2⁶ = 84644323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84644317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39218 + ... + 41319.

It is an arithmetic number, because the mean of its divisors is an integer number (21181494).

Almost surely, 2^84644387 is an apocalyptic number.

84644387 is a deficient number, since it is larger than the sum of its proper divisors (81589).

84644387 is a wasteful number, since it uses less digits than its factorization.

84644387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81588.

The product of its digits is 516096, while the sum is 44.

The square root of 84644387 is about 9200.2384208237. The cubic root of 84644387 is about 439.0689455038.

The spelling of 84644387 in words is "eighty-four million, six hundred forty-four thousand, three hundred eighty-seven".