70905 has 16 divisors (see below), whose sum is σ = 118080. Its totient is φ = 36288.

The previous prime is 70901. The next prime is 70913. The reversal of 70905 is 50907.

70905 = T₁₂₁ + T₁₂₂ + ... + T₁₂₉.

It is not a de Polignac number, because 70905 - 2² = 70901 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (70901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 354 + ... + 516.

It is an arithmetic number, because the mean of its divisors is an integer number (7380).

2⁷⁰⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

70905 is a deficient number, since it is larger than the sum of its proper divisors (47175).

70905 is a wasteful number, since it uses less digits than its factorization.

70905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200.

The product of its (nonzero) digits is 315, while the sum is 21.

The square root of 70905 is about 266.2799278954. The cubic root of 70905 is about 41.3897008150.

The spelling of 70905 in words is "seventy thousand, nine hundred five".