82578069 has 24 divisors (see below), whose sum is σ = 140026560. Its totient is φ = 47116080.

The previous prime is 82578053. The next prime is 82578071. The reversal of 82578069 is 96087528.

It is not a de Polignac number, because 82578069 - 2⁴ = 82578053 is a prime.

It is a super-3 number, since 3×82578069³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82578029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 124599 + ... + 125259.

It is an arithmetic number, because the mean of its divisors is an integer number (5834440).

Almost surely, 2^82578069 is an apocalyptic number.

It is an amenable number.

82578069 is a deficient number, since it is larger than the sum of its proper divisors (57448491).

82578069 is an frugal number, since it uses more digits than its factorization.

82578069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338 (or 671 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 82578069 is about 9087.2476030974. The cubic root of 82578069 is about 435.4666573475.

The spelling of 82578069 in words is "eighty-two million, five hundred seventy-eight thousand, sixty-nine".