70686681 has 16 divisors (see below), whose sum is σ = 101660160. Its totient is φ = 43430400.

The previous prime is 70686667. The next prime is 70686689. The reversal of 70686681 is 18668607.

It is not a de Polignac number, because 70686681 - 2¹⁸ = 70424537 is a prime.

It is a super-2 number, since 2×70686681² = 9993213741591522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (70686689) 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, 35256 + ... + 37206.

It is an arithmetic number, because the mean of its divisors is an integer number (6353760).

Almost surely, 2^70686681 is an apocalyptic number.

It is an amenable number.

70686681 is a deficient number, since it is larger than the sum of its proper divisors (30973479).

70686681 is a wasteful number, since it uses less digits than its factorization.

70686681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2896.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 70686681 is about 8407.5371542444. The cubic root of 70686681 is about 413.4717702402.

The spelling of 70686681 in words is "seventy million, six hundred eighty-six thousand, six hundred eighty-one".