81182404 has 12 divisors (see below), whose sum is σ = 143534524. Its totient is φ = 40172544.

The previous prime is 81182377. The next prime is 81182411. The reversal of 81182404 is 40428118.

It can be written as a sum of positive squares in 2 ways, for example, as 36024004 + 45158400 = 6002^2 + 6720^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104229 + ... + 105004.

Almost surely, 2^81182404 is an apocalyptic number.

It is an amenable number.

81182404 is a deficient number, since it is larger than the sum of its proper divisors (62352120).

81182404 is a wasteful number, since it uses less digits than its factorization.

81182404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209334 (or 209332 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 81182404 is about 9010.1278570284. The cubic root of 81182404 is about 432.9994079645. Note that the first 3 decimals are identical.

The spelling of 81182404 in words is "eighty-one million, one hundred eighty-two thousand, four hundred four".