81036404 has 12 divisors (see below), whose sum is σ = 142222500. Its totient is φ = 40401408.

The previous prime is 81036367. The next prime is 81036407. The reversal of 81036404 is 40463018.

It can be written as a sum of positive squares in 2 ways, for example, as 59320804 + 21715600 = 7702^2 + 4660^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81036407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27629 + ... + 30420.

It is an arithmetic number, because the mean of its divisors is an integer number (11851875).

Almost surely, 2^81036404 is an apocalyptic number.

It is an amenable number.

81036404 is a deficient number, since it is larger than the sum of its proper divisors (61186096).

81036404 is a wasteful number, since it uses less digits than its factorization.

81036404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58402 (or 58400 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 81036404 is about 9002.0222172576. The cubic root of 81036404 is about 432.7396807092.

The spelling of 81036404 in words is "eighty-one million, thirty-six thousand, four hundred four".