70000009 has 4 divisors (see below), whose sum is σ = 73684240. Its totient is φ = 66315780.

The previous prime is 69999989. The next prime is 70000027. The reversal of 70000009 is 90000007.

It is a happy number.

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: 90000007 = 859 ⋅104773.

It is a cyclic number.

It is not a de Polignac number, because 70000009 - 2¹⁵ = 69967241 is a prime.

It is a Duffinian number.

70000009 is a modest number, since divided by 9 gives 7 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 69999947 and 70000001.

It is not an unprimeable number, because it can be changed into a prime (70000069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1842087 + ... + 1842124.

It is an arithmetic number, because the mean of its divisors is an integer number (18421060).

Almost surely, 2^70000009 is an apocalyptic number.

It is an amenable number.

70000009 is a deficient number, since it is larger than the sum of its proper divisors (3684231).

70000009 is a wasteful number, since it uses less digits than its factorization.

70000009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3684230.

The product of its (nonzero) digits is 63, while the sum is 16.

The square root of 70000009 is about 8366.6008031936. The cubic root of 70000009 is about 412.1285476435.

The spelling of 70000009 in words is "seventy million, nine", and thus it is an aban number and an uban number.