82778349 has 8 divisors (see below), whose sum is σ = 110762272. Its totient is φ = 54990000.

The previous prime is 82778347. The next prime is 82778363. The reversal of 82778349 is 94387728.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 82778349 - 2¹ = 82778347 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 82778298 and 82778307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82778347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47902 + ... + 49599.

It is an arithmetic number, because the mean of its divisors is an integer number (13845284).

Almost surely, 2^82778349 is an apocalyptic number.

It is an amenable number.

82778349 is a deficient number, since it is larger than the sum of its proper divisors (27983923).

82778349 is a wasteful number, since it uses less digits than its factorization.

82778349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97787.

The product of its digits is 677376, while the sum is 48.

The square root of 82778349 is about 9098.2607678611. The cubic root of 82778349 is about 435.8184248693.

The spelling of 82778349 in words is "eighty-two million, seven hundred seventy-eight thousand, three hundred forty-nine".