70505309 has 8 divisors (see below), whose sum is σ = 80658240. Its totient is φ = 60372576.

The previous prime is 70505249. The next prime is 70505389. The reversal of 70505309 is 90350507.

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

It is a cyclic number.

It is not a de Polignac number, because 70505309 - 2¹⁶ = 70439773 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70505389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3377 + ... + 12345.

It is an arithmetic number, because the mean of its divisors is an integer number (10082280).

Almost surely, 2^70505309 is an apocalyptic number.

It is an amenable number.

70505309 is a deficient number, since it is larger than the sum of its proper divisors (10152931).

70505309 is a wasteful number, since it uses less digits than its factorization.

70505309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10099.

The product of its (nonzero) digits is 4725, while the sum is 29.

The square root of 70505309 is about 8396.7439522710. The cubic root of 70505309 is about 413.1178307039.

The spelling of 70505309 in words is "seventy million, five hundred five thousand, three hundred nine".