82178266 has 4 divisors (see below), whose sum is σ = 123267402. Its totient is φ = 41089132.

The previous prime is 82178263. The next prime is 82178267. The reversal of 82178266 is 66287128.

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., 71149225 + 11029041 = 8435^2 + 3321^2 .

It is not an unprimeable number, because it can be changed into a prime (82178263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20544565 + ... + 20544568.

Almost surely, 2^82178266 is an apocalyptic number.

82178266 is a deficient number, since it is larger than the sum of its proper divisors (41089136).

82178266 is a wasteful number, since it uses less digits than its factorization.

82178266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41089135.

The product of its digits is 64512, while the sum is 40.

The square root of 82178266 is about 9065.2228874970. Note that the first 3 decimals coincide. The cubic root of 82178266 is about 434.7627472698.

The spelling of 82178266 in words is "eighty-two million, one hundred seventy-eight thousand, two hundred sixty-six".