76647206309 has 4 divisors (see below), whose sum is σ = 76685938560. Its totient is φ = 76608474060.

The previous prime is 76647206299. The next prime is 76647206333. The reversal of 76647206309 is 90360274667.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90360274667 = 13 ⋅6950790359.

It is a cyclic number.

It is not a de Polignac number, because 76647206309 - 2²⁰ = 76646157733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76647406309) 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, 19363157 + ... + 19367114.

It is an arithmetic number, because the mean of its divisors is an integer number (19171484640).

Almost surely, 2^76647206309 is an apocalyptic number.

It is an amenable number.

76647206309 is a deficient number, since it is larger than the sum of its proper divisors (38732251).

76647206309 is a wasteful number, since it uses less digits than its factorization.

76647206309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38732250.

The product of its (nonzero) digits is 2286144, while the sum is 50.

The spelling of 76647206309 in words is "seventy-six billion, six hundred forty-seven million, two hundred six thousand, three hundred nine".