8209785957 has 4 divisors (see below), whose sum is σ = 10946381280. Its totient is φ = 5473190636.

The previous prime is 8209785931. The next prime is 8209785971. The reversal of 8209785957 is 7595879028.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8209785957 - 2²³ = 8201397349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8209785957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8209785907) 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, 1368297657 + ... + 1368297662.

It is an arithmetic number, because the mean of its divisors is an integer number (2736595320).

Almost surely, 2^8209785957 is an apocalyptic number.

It is an amenable number.

8209785957 is a deficient number, since it is larger than the sum of its proper divisors (2736595323).

8209785957 is a wasteful number, since it uses less digits than its factorization.

8209785957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2736595322.

The product of its (nonzero) digits is 12700800, while the sum is 60.

The square root of 8209785957 is about 90607.8691781238. The cubic root of 8209785957 is about 2017.3315381358.

The spelling of 8209785957 in words is "eight billion, two hundred nine million, seven hundred eighty-five thousand, nine hundred fifty-seven".