81737382 has 8 divisors (see below), whose sum is σ = 163474776. Its totient is φ = 27245792.

The previous prime is 81737363. The next prime is 81737389. The reversal of 81737382 is 28373718.

It is a sphenic number, since it is the product of 3 distinct primes.

81737382 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 81737382.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81737389) 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, 6811443 + ... + 6811454.

It is an arithmetic number, because the mean of its divisors is an integer number (20434347).

Almost surely, 2^81737382 is an apocalyptic number.

81737382 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.

81737382 is a wasteful number, since it uses less digits than its factorization.

81737382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13622902.

The product of its digits is 56448, while the sum is 39.

The square root of 81737382 is about 9040.8728560908. The cubic root of 81737382 is about 433.9838562096.

The spelling of 81737382 in words is "eighty-one million, seven hundred thirty-seven thousand, three hundred eighty-two".