70605709 has 4 divisors (see below), whose sum is σ = 74759004. Its totient is φ = 66452416.

The previous prime is 70605707. The next prime is 70605721. The reversal of 70605709 is 90750607.

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 57078025 + 13527684 = 7555^2 + 3678^2 .

It is a cyclic number.

It is not a de Polignac number, because 70605709 - 2¹ = 70605707 is a prime.

It is a super-2 number, since 2×70605709² = 9970332286785362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70605707) 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, 2076622 + ... + 2076655.

It is an arithmetic number, because the mean of its divisors is an integer number (18689751).

Almost surely, 2^70605709 is an apocalyptic number.

It is an amenable number.

70605709 is a deficient number, since it is larger than the sum of its proper divisors (4153295).

70605709 is a wasteful number, since it uses less digits than its factorization.

70605709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4153294.

The product of its (nonzero) digits is 13230, while the sum is 34.

The square root of 70605709 is about 8402.7203333206. The cubic root of 70605709 is about 413.3138318207.

It can be divided in two parts, 7060 and 5709, that added together give a square (12769 = 113²).

The spelling of 70605709 in words is "seventy million, six hundred five thousand, seven hundred nine".