82278609 has 8 divisors (see below), whose sum is σ = 125376960. Its totient is φ = 47016336.

The previous prime is 82278593. The next prime is 82278641. The reversal of 82278609 is 90687228.

It is a happy number.

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

It is not a de Polignac number, because 82278609 - 2⁴ = 82278593 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (82278689) 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, 1958994 + ... + 1959035.

It is an arithmetic number, because the mean of its divisors is an integer number (15672120).

Almost surely, 2^82278609 is an apocalyptic number.

It is an amenable number.

82278609 is a deficient number, since it is larger than the sum of its proper divisors (43098351).

82278609 is a wasteful number, since it uses less digits than its factorization.

82278609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3918039.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 82278609 is about 9070.7557017042. The cubic root of 82278609 is about 434.9396296191.

It can be divided in two parts, 8227 and 8609, that added together give a triangular number (16836 = T₁₈₃).

The spelling of 82278609 in words is "eighty-two million, two hundred seventy-eight thousand, six hundred nine".