82778351 has 4 divisors (see below), whose sum is σ = 83326704. Its totient is φ = 82230000.

The previous prime is 82778347. The next prime is 82778363. The reversal of 82778351 is 15387728.

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

It is a cyclic number.

It is not a de Polignac number, because 82778351 - 2² = 82778347 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 82778299 and 82778308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82778051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273950 + ... + 274251.

It is an arithmetic number, because the mean of its divisors is an integer number (20831676).

Almost surely, 2^82778351 is an apocalyptic number.

82778351 is a deficient number, since it is larger than the sum of its proper divisors (548353).

82778351 is a wasteful number, since it uses less digits than its factorization.

82778351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548352.

The product of its digits is 94080, while the sum is 41.

The square root of 82778351 is about 9098.2608777722. The cubic root of 82778351 is about 435.8184283792.

The spelling of 82778351 in words is "eighty-two million, seven hundred seventy-eight thousand, three hundred fifty-one".