82678385 has 4 divisors (see below), whose sum is σ = 99214068. Its totient is φ = 66142704.

The previous prime is 82678381. The next prime is 82678403. The reversal of 82678385 is 58387628.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55294096 + 27384289 = 7436^2 + 5233^2 .

It is a cyclic number.

It is not a de Polignac number, because 82678385 - 2² = 82678381 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (82678381) 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, 8267834 + ... + 8267843.

It is an arithmetic number, because the mean of its divisors is an integer number (24803517).

Almost surely, 2^82678385 is an apocalyptic number.

It is an amenable number.

82678385 is a deficient number, since it is larger than the sum of its proper divisors (16535683).

82678385 is a wasteful number, since it uses less digits than its factorization.

82678385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16535682.

The product of its digits is 645120, while the sum is 47.

The square root of 82678385 is about 9092.7655309042. The cubic root of 82678385 is about 435.6429212410.

The spelling of 82678385 in words is "eighty-two million, six hundred seventy-eight thousand, three hundred eighty-five".