82091278 has 12 divisors (see below), whose sum is σ = 128725128. Its totient is φ = 39260540.

The previous prime is 82091239. The next prime is 82091291. The reversal of 82091278 is 87219028.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37738 + ... + 39853.

It is an arithmetic number, because the mean of its divisors is an integer number (10727094).

Almost surely, 2^82091278 is an apocalyptic number.

82091278 is a deficient number, since it is larger than the sum of its proper divisors (46633850).

82091278 is a wasteful number, since it uses less digits than its factorization.

82091278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77639 (or 77616 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 82091278 is about 9060.4237207760. The cubic root of 82091278 is about 434.6092902559.

It can be divided in two parts, 82091 and 278, that added together give a square (82369 = 287²).

The spelling of 82091278 in words is "eighty-two million, ninety-one thousand, two hundred seventy-eight".