81402204 has 24 divisors (see below), whose sum is σ = 204549520. Its totient is φ = 25046784.

The previous prime is 81402203. The next prime is 81402229. The reversal of 81402204 is 40220418.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81402203) 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, 260749 + ... + 261060.

Almost surely, 2^81402204 is an apocalyptic number.

It is an amenable number.

81402204 is an abundant number, since it is smaller than the sum of its proper divisors (123147316).

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

81402204 is a wasteful number, since it uses less digits than its factorization.

81402204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521829 (or 521827 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 81402204 is about 9022.3169973128. The cubic root of 81402204 is about 433.3898353675.

The spelling of 81402204 in words is "eighty-one million, four hundred two thousand, two hundred four".