81775204 has 12 divisors (see below), whose sum is σ = 163550464. Its totient is φ = 35046504.

The previous prime is 81775201. The next prime is 81775271. The reversal of 81775204 is 40257718.

It is a happy number.

81775204 is an admirable number.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 81775204.

It is not an unprimeable number, because it can be changed into a prime (81775201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1460244 + ... + 1460299.

Almost surely, 2^81775204 is an apocalyptic number.

It is an amenable number.

81775204 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81775204 is a wasteful number, since it uses less digits than its factorization.

81775204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2920554 (or 2920552 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 81775204 is about 9042.9643369860. The cubic root of 81775204 is about 434.0507844046.

The spelling of 81775204 in words is "eighty-one million, seven hundred seventy-five thousand, two hundred four".