84640867 has 4 divisors (see below), whose sum is σ = 86928496. Its totient is φ = 82353240.

The previous prime is 84640861. The next prime is 84640901. The reversal of 84640867 is 76804648.

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 84640867 - 2³ = 84640859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84640861) 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, 1143759 + ... + 1143832.

It is an arithmetic number, because the mean of its divisors is an integer number (21732124).

Almost surely, 2^84640867 is an apocalyptic number.

84640867 is a deficient number, since it is larger than the sum of its proper divisors (2287629).

84640867 is a wasteful number, since it uses less digits than its factorization.

84640867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2287628.

The product of its (nonzero) digits is 258048, while the sum is 43.

The square root of 84640867 is about 9200.0471194446. The cubic root of 84640867 is about 439.0628590829.

The spelling of 84640867 in words is "eighty-four million, six hundred forty thousand, eight hundred sixty-seven".