70689709 has 4 divisors (see below), whose sum is σ = 74410240. Its totient is φ = 66969180.

The previous prime is 70689691. The next prime is 70689713. The reversal of 70689709 is 90798607.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90798607 = 1669 ⋅54403.

It is a cyclic number.

It is not a de Polignac number, because 70689709 - 2⁹ = 70689197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70689719) 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, 1860237 + ... + 1860274.

It is an arithmetic number, because the mean of its divisors is an integer number (18602560).

Almost surely, 2^70689709 is an apocalyptic number.

It is an amenable number.

70689709 is a deficient number, since it is larger than the sum of its proper divisors (3720531).

70689709 is a wasteful number, since it uses less digits than its factorization.

70689709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3720530.

The product of its (nonzero) digits is 190512, while the sum is 46.

The square root of 70689709 is about 8407.7172288321. The cubic root of 70689709 is about 413.4776741088.

The spelling of 70689709 in words is "seventy million, six hundred eighty-nine thousand, seven hundred nine".