70045909 has 4 divisors (see below), whose sum is σ = 71005516. Its totient is φ = 69086304.

The previous prime is 70045901. The next prime is 70045919. The reversal of 70045909 is 90954007.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90954007 = 19 ⋅4787053.

It can be written as a sum of positive squares in 2 ways, for example, as 13118884 + 56927025 = 3622^2 + 7545^2 .

It is a cyclic number.

It is not a de Polignac number, because 70045909 - 2³ = 70045901 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 (70045901) 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, 479694 + ... + 479839.

It is an arithmetic number, because the mean of its divisors is an integer number (17751379).

Almost surely, 2^70045909 is an apocalyptic number.

It is an amenable number.

70045909 is a deficient number, since it is larger than the sum of its proper divisors (959607).

70045909 is an equidigital number, since it uses as much as digits as its factorization.

70045909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959606.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 70045909 is about 8369.3434031589. The cubic root of 70045909 is about 412.2186074757.

The spelling of 70045909 in words is "seventy million, forty-five thousand, nine hundred nine".