82678549 has 2 divisors, whose sum is σ = 82678550. Its totient is φ = 82678548.

The previous prime is 82678513. The next prime is 82678567. The reversal of 82678549 is 94587628.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80676324 + 2002225 = 8982^2 + 1415^2 .

It is a cyclic number.

It is not a de Polignac number, because 82678549 - 2¹¹ = 82676501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82678049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41339274 + 41339275.

It is an arithmetic number, because the mean of its divisors is an integer number (41339275).

Almost surely, 2^82678549 is an apocalyptic number.

It is an amenable number.

82678549 is a deficient number, since it is larger than the sum of its proper divisors (1).

82678549 is an equidigital number, since it uses as much as digits as its factorization.

82678549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 49.

The square root of 82678549 is about 9092.7745490582. The cubic root of 82678549 is about 435.6432092864.

The spelling of 82678549 in words is "eighty-two million, six hundred seventy-eight thousand, five hundred forty-nine".