82405780 has 24 divisors (see below), whose sum is σ = 180577152. Its totient is φ = 31528992.

The previous prime is 82405753. The next prime is 82405787. The reversal of 82405780 is 8750428.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82405787) 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 in 7 ways as a sum of consecutive naturals, for example, 89112 + ... + 90031.

It is an arithmetic number, because the mean of its divisors is an integer number (7524048).

Almost surely, 2^82405780 is an apocalyptic number.

It is an amenable number.

82405780 is an abundant number, since it is smaller than the sum of its proper divisors (98171372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

82405780 is a wasteful number, since it uses less digits than its factorization.

82405780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179175 (or 179173 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 82405780 is about 9077.7629402844. The cubic root of 82405780 is about 435.1635972493.

The spelling of 82405780 in words is "eighty-two million, four hundred five thousand, seven hundred eighty".