84640005 has 16 divisors (see below), whose sum is σ = 150471360. Its totient is φ = 45141264.

The previous prime is 84639967. The next prime is 84640027. The reversal of 84640005 is 50004648.

It is not a de Polignac number, because 84640005 - 2⁸ = 84639749 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 313347 + ... + 313616.

It is an arithmetic number, because the mean of its divisors is an integer number (9404460).

Almost surely, 2^84640005 is an apocalyptic number.

It is an amenable number.

84640005 is a deficient number, since it is larger than the sum of its proper divisors (65831355).

84640005 is a wasteful number, since it uses less digits than its factorization.

84640005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626977 (or 626971 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 84640005 is about 9200.0002717391. Note that the first 3 decimals coincide. The cubic root of 84640005 is about 439.0613685757.

The spelling of 84640005 in words is "eighty-four million, six hundred forty thousand, five".