71970309 has 32 divisors (see below), whose sum is σ = 112896000. Its totient is φ = 45187632.

The previous prime is 71970307. The next prime is 71970319. The reversal of 71970309 is 90307917.

It is not a de Polignac number, because 71970309 - 2¹ = 71970307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71970307) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 122314 + ... + 122900.

It is an arithmetic number, because the mean of its divisors is an integer number (3528000).

Almost surely, 2^71970309 is an apocalyptic number.

It is an amenable number.

71970309 is a deficient number, since it is larger than the sum of its proper divisors (40925691).

71970309 is a wasteful number, since it uses less digits than its factorization.

71970309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854 (or 848 counting only the distinct ones).

The product of its (nonzero) digits is 11907, while the sum is 36.

The square root of 71970309 is about 8483.5316348794. The cubic root of 71970309 is about 415.9595717769.

The spelling of 71970309 in words is "seventy-one million, nine hundred seventy thousand, three hundred nine".