69720309 has 6 divisors (see below), whose sum is σ = 100707126. Its totient is φ = 46480200.

The previous prime is 69720289. The next prime is 69720311. The reversal of 69720309 is 90302796.

It can be written as a sum of positive squares in only one way, i.e., 63202500 + 6517809 = 7950^2 + 2553^2 .

It is not a de Polignac number, because 69720309 - 2¹³ = 69712117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69720319) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3873342 + ... + 3873359.

It is an arithmetic number, because the mean of its divisors is an integer number (16784521).

Almost surely, 2^69720309 is an apocalyptic number.

It is an amenable number.

69720309 is a deficient number, since it is larger than the sum of its proper divisors (30986817).

69720309 is a wasteful number, since it uses less digits than its factorization.

69720309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7746707 (or 7746704 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 69720309 is about 8349.8688013645. The cubic root of 69720309 is about 411.5788990081.

The spelling of 69720309 in words is "sixty-nine million, seven hundred twenty thousand, three hundred nine".