82578766 has 4 divisors (see below), whose sum is σ = 123868152. Its totient is φ = 41289382.

The previous prime is 82578757. The next prime is 82578767. The reversal of 82578766 is 66787528.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82578767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20644690 + ... + 20644693.

It is an arithmetic number, because the mean of its divisors is an integer number (30967038).

Almost surely, 2^82578766 is an apocalyptic number.

82578766 is a deficient number, since it is larger than the sum of its proper divisors (41289386).

82578766 is a wasteful number, since it uses less digits than its factorization.

82578766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41289385.

The product of its digits is 1128960, while the sum is 49.

The square root of 82578766 is about 9087.2859534627. The cubic root of 82578766 is about 435.4678825291.

The spelling of 82578766 in words is "eighty-two million, five hundred seventy-eight thousand, seven hundred sixty-six".