82878013 has 4 divisors (see below), whose sum is σ = 83483100. Its totient is φ = 82272928.

The previous prime is 82878007. The next prime is 82878053. The reversal of 82878013 is 31087828.

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 52606009 + 30272004 = 7253^2 + 5502^2 .

It is a cyclic number.

It is not a de Polignac number, because 82878013 - 2¹⁷ = 82746941 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 (82878053) 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, 302338 + ... + 302611.

It is an arithmetic number, because the mean of its divisors is an integer number (20870775).

Almost surely, 2^82878013 is an apocalyptic number.

It is an amenable number.

82878013 is a deficient number, since it is larger than the sum of its proper divisors (605087).

82878013 is a wasteful number, since it uses less digits than its factorization.

82878013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605086.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 82878013 is about 9103.7362110290. The cubic root of 82878013 is about 435.9932611954.

The spelling of 82878013 in words is "eighty-two million, eight hundred seventy-eight thousand, thirteen".