82712978 has 4 divisors (see below), whose sum is σ = 124069470. Its totient is φ = 41356488.

The previous prime is 82712963. The next prime is 82712983. The reversal of 82712978 is 87921728.

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

It can be written as a sum of positive squares in only one way, i.e., 75811849 + 6901129 = 8707^2 + 2627^2 .

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 as a sum of consecutive naturals, namely, 20678243 + ... + 20678246.

Almost surely, 2^82712978 is an apocalyptic number.

82712978 is a deficient number, since it is larger than the sum of its proper divisors (41356492).

82712978 is a wasteful number, since it uses less digits than its factorization.

82712978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41356491.

The product of its digits is 112896, while the sum is 44.

The square root of 82712978 is about 9094.6675585202. The cubic root of 82712978 is about 435.7036710740.

The spelling of 82712978 in words is "eighty-two million, seven hundred twelve thousand, nine hundred seventy-eight".