82678709 has 4 divisors (see below), whose sum is σ = 87030240. Its totient is φ = 78327180.

The previous prime is 82678697. The next prime is 82678727. The reversal of 82678709 is 90787628.

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 82678709 - 2⁴ = 82678693 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 (82678109) 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, 2175737 + ... + 2175774.

It is an arithmetic number, because the mean of its divisors is an integer number (21757560).

Almost surely, 2^82678709 is an apocalyptic number.

It is an amenable number.

82678709 is a deficient number, since it is larger than the sum of its proper divisors (4351531).

82678709 is a wasteful number, since it uses less digits than its factorization.

82678709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4351530.

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 82678709 is about 9092.7833472485. The cubic root of 82678709 is about 435.6434903060.

The spelling of 82678709 in words is "eighty-two million, six hundred seventy-eight thousand, seven hundred nine".