82078289 has 4 divisors (see below), whose sum is σ = 82629300. Its totient is φ = 81527280.

The previous prime is 82078273. The next prime is 82078301. The reversal of 82078289 is 98287028.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7980625 + 74097664 = 2825^2 + 8608^2 .

It is a cyclic number.

It is not a de Polignac number, because 82078289 - 2⁴ = 82078273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82078229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275282 + ... + 275579.

It is an arithmetic number, because the mean of its divisors is an integer number (20657325).

Almost surely, 2^82078289 is an apocalyptic number.

It is an amenable number.

82078289 is a deficient number, since it is larger than the sum of its proper divisors (551011).

82078289 is a wasteful number, since it uses less digits than its factorization.

82078289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551010.

The product of its (nonzero) digits is 129024, while the sum is 44.

The square root of 82078289 is about 9059.7068937135. The cubic root of 82078289 is about 434.5863668388.

The spelling of 82078289 in words is "eighty-two million, seventy-eight thousand, two hundred eighty-nine".