82581378 has 32 divisors (see below), whose sum is σ = 182725632. Its totient is φ = 24670800.

The previous prime is 82581361. The next prime is 82581379. The reversal of 82581378 is 87318528.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (82581379) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4126 + ... + 13497.

It is an arithmetic number, because the mean of its divisors is an integer number (5710176).

Almost surely, 2^82581378 is an apocalyptic number.

82581378 is an abundant number, since it is smaller than the sum of its proper divisors (100144254).

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

82581378 is a wasteful number, since it uses less digits than its factorization.

82581378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17710.

The product of its digits is 107520, while the sum is 42.

The square root of 82581378 is about 9087.4296696041. The cubic root of 82581378 is about 435.4724738229.

The spelling of 82581378 in words is "eighty-two million, five hundred eighty-one thousand, three hundred seventy-eight".