81202404 has 48 divisors (see below), whose sum is σ = 205305408. Its totient is φ = 24880128.

The previous prime is 81202399. The next prime is 81202439. The reversal of 81202404 is 40420218.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4144 + ... + 13400.

It is an arithmetic number, because the mean of its divisors is an integer number (4277196).

Almost surely, 2^81202404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81202404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102652704).

81202404 is an abundant number, since it is smaller than the sum of its proper divisors (124103004).

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

81202404 is a wasteful number, since it uses less digits than its factorization.

81202404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9324 (or 9322 counting only the distinct ones).

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

The square root of 81202404 is about 9011.2376508446. The cubic root of 81202404 is about 433.0349627837.

The spelling of 81202404 in words is "eighty-one million, two hundred two thousand, four hundred four".