70681817 has 4 divisors (see below), whose sum is σ = 70701876. Its totient is φ = 70661760.

The previous prime is 70681799. The next prime is 70681837. The reversal of 70681817 is 71818607.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50395801 + 20286016 = 7099^2 + 4504^2 .

It is a cyclic number.

It is not a de Polignac number, because 70681817 - 2¹⁰ = 70680793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70681837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3188 + ... + 12309.

It is an arithmetic number, because the mean of its divisors is an integer number (17675469).

Almost surely, 2^70681817 is an apocalyptic number.

It is an amenable number.

70681817 is a deficient number, since it is larger than the sum of its proper divisors (20059).

70681817 is a wasteful number, since it uses less digits than its factorization.

70681817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20058.

The product of its (nonzero) digits is 18816, while the sum is 38.

The square root of 70681817 is about 8407.2478850097. The cubic root of 70681817 is about 413.4622862620.

The spelling of 70681817 in words is "seventy million, six hundred eighty-one thousand, eight hundred seventeen".