82778275 has 6 divisors (see below), whose sum is σ = 102645092. Its totient is φ = 66222600.

The previous prime is 82778273. The next prime is 82778309. The reversal of 82778275 is 57287728.

It is not a de Polignac number, because 82778275 - 2¹ = 82778273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82778273) 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, 1655541 + ... + 1655590.

Almost surely, 2^82778275 is an apocalyptic number.

82778275 is a deficient number, since it is larger than the sum of its proper divisors (19866817).

82778275 is a wasteful number, since it uses less digits than its factorization.

82778275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3311141 (or 3311136 counting only the distinct ones).

The product of its digits is 439040, while the sum is 46.

The square root of 82778275 is about 9098.2567011489. The cubic root of 82778275 is about 435.8182950021.

The spelling of 82778275 in words is "eighty-two million, seven hundred seventy-eight thousand, two hundred seventy-five".