82787013 has 6 divisors (see below), whose sum is σ = 119581254. Its totient is φ = 55191336.

The previous prime is 82787011. The next prime is 82787017. The reversal of 82787013 is 31078728.

It can be written as a sum of positive squares in only one way, i.e., 82573569 + 213444 = 9087^2 + 462^2 .

It is not a de Polignac number, because 82787013 - 2¹ = 82787011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82787011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4599270 + ... + 4599287.

It is an arithmetic number, because the mean of its divisors is an integer number (19930209).

Almost surely, 2^82787013 is an apocalyptic number.

It is an amenable number.

82787013 is a deficient number, since it is larger than the sum of its proper divisors (36794241).

82787013 is a wasteful number, since it uses less digits than its factorization.

82787013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9198563 (or 9198560 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 82787013 is about 9098.7368903601. The cubic root of 82787013 is about 435.8336293245.

The spelling of 82787013 in words is "eighty-two million, seven hundred eighty-seven thousand, thirteen".