79705905 has 32 divisors (see below), whose sum is σ = 131289984. Its totient is φ = 41273856.

The previous prime is 79705897. The next prime is 79705909. The reversal of 79705905 is 50950797.

It is a happy number.

It is not a de Polignac number, because 79705905 - 2³ = 79705897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79705909) 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 31 ways as a sum of consecutive naturals, for example, 84597 + ... + 85533.

It is an arithmetic number, because the mean of its divisors is an integer number (4102812).

Almost surely, 2^79705905 is an apocalyptic number.

It is an amenable number.

79705905 is a deficient number, since it is larger than the sum of its proper divisors (51584079).

79705905 is a wasteful number, since it uses less digits than its factorization.

79705905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105.

The product of its (nonzero) digits is 99225, while the sum is 42.

The square root of 79705905 is about 8927.8163623587. The cubic root of 79705905 is about 430.3582826056.

The spelling of 79705905 in words is "seventy-nine million, seven hundred five thousand, nine hundred five".