79805685 has 32 divisors (see below), whose sum is σ = 130014720. Its totient is φ = 41796608.

The previous prime is 79805669. The next prime is 79805689. The reversal of 79805685 is 58650897.

It is a 5-Lehmer number, since φ(79805685) divides (79805685-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 79805685 - 2⁴ = 79805669 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79805689) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 333796 + ... + 334034.

It is an arithmetic number, because the mean of its divisors is an integer number (4062960).

Almost surely, 2^79805685 is an apocalyptic number.

It is an amenable number.

79805685 is a deficient number, since it is larger than the sum of its proper divisors (50209035).

79805685 is a wasteful number, since it uses less digits than its factorization.

79805685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557.

The product of its (nonzero) digits is 604800, while the sum is 48.

The square root of 79805685 is about 8933.4027671431. The cubic root of 79805685 is about 430.5377893529.

The spelling of 79805685 in words is "seventy-nine million, eight hundred five thousand, six hundred eighty-five".