70809945 has 8 divisors (see below), whose sum is σ = 113295936. Its totient is φ = 37765296.

The previous prime is 70809943. The next prime is 70809953. The reversal of 70809945 is 54990807.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 70809945 - 2¹ = 70809943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 70809897 and 70809906.

It is not an unprimeable number, because it can be changed into a prime (70809943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2360317 + ... + 2360346.

It is an arithmetic number, because the mean of its divisors is an integer number (14161992).

Almost surely, 2^70809945 is an apocalyptic number.

It is an amenable number.

70809945 is a deficient number, since it is larger than the sum of its proper divisors (42485991).

70809945 is a wasteful number, since it uses less digits than its factorization.

70809945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4720671.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 70809945 is about 8414.8645265387. The cubic root of 70809945 is about 413.7119691346.

The spelling of 70809945 in words is "seventy million, eight hundred nine thousand, nine hundred forty-five".