84640705 has 16 divisors (see below), whose sum is σ = 111255120. Its totient is φ = 61530112.

The previous prime is 84640697. The next prime is 84640709. The reversal of 84640705 is 50704648.

It can be written as a sum of positive squares in 8 ways, for example, as 294849 + 84345856 = 543^2 + 9184^2 .

It is not a de Polignac number, because 84640705 - 2³ = 84640697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84640709) 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 15 ways as a sum of consecutive naturals, for example, 14704 + ... + 19633.

It is an arithmetic number, because the mean of its divisors is an integer number (6953445).

Almost surely, 2^84640705 is an apocalyptic number.

84640705 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

84640705 is a deficient number, since it is larger than the sum of its proper divisors (26614415).

84640705 is a wasteful number, since it uses less digits than its factorization.

84640705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34388.

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 84640705 is about 9200.0383151376. The cubic root of 84640705 is about 439.0625789651.

The spelling of 84640705 in words is "eighty-four million, six hundred forty thousand, seven hundred five".