81704152 has 16 divisors (see below), whose sum is σ = 154713600. Its totient is φ = 40447200.

The previous prime is 81704149. The next prime is 81704153. The reversal of 81704152 is 25140718.

It is a self number, because there is not a number n which added to its sum of digits gives 81704152.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81704153) 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, 49752 + ... + 51367.

It is an arithmetic number, because the mean of its divisors is an integer number (9669600).

Almost surely, 2^81704152 is an apocalyptic number.

It is an amenable number.

81704152 is a deficient number, since it is larger than the sum of its proper divisors (73009448).

81704152 is a wasteful number, since it uses less digits than its factorization.

81704152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101226 (or 101222 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 81704152 is about 9039.0349042362. The cubic root of 81704152 is about 433.9250367812.

The spelling of 81704152 in words is "eighty-one million, seven hundred four thousand, one hundred fifty-two".