82181408 has 12 divisors (see below), whose sum is σ = 161794710. Its totient is φ = 41090688.

The previous prime is 82181381. The next prime is 82181413. The reversal of 82181408 is 80418128.

It can be written as a sum of positive squares in only one way, i.e., 69422224 + 12759184 = 8332^2 + 3572^2 .

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 2568169 = 82181408 / (8 + 2 + 1 + 8 + 1 + 4 + 0 + 8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1284053 + ... + 1284116.

Almost surely, 2^82181408 is an apocalyptic number.

It is an amenable number.

82181408 is a deficient number, since it is larger than the sum of its proper divisors (79613302).

82181408 is a wasteful number, since it uses less digits than its factorization.

82181408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2568179 (or 2568171 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 32.

The square root of 82181408 is about 9065.3961854957. The cubic root of 82181408 is about 434.7682880988.

The spelling of 82181408 in words is "eighty-two million, one hundred eighty-one thousand, four hundred eight".