81837076 has 6 divisors (see below), whose sum is σ = 143214890. Its totient is φ = 40918536.

The previous prime is 81837053. The next prime is 81837079. The reversal of 81837076 is 67073818.

It can be written as a sum of positive squares in only one way, i.e., 53640976 + 28196100 = 7324^2 + 5310^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81837079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10229631 + ... + 10229638.

Almost surely, 2^81837076 is an apocalyptic number.

It is an amenable number.

81837076 is a deficient number, since it is larger than the sum of its proper divisors (61377814).

81837076 is a wasteful number, since it uses less digits than its factorization.

81837076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20459273 (or 20459271 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 81837076 is about 9046.3846922403. The cubic root of 81837076 is about 434.1602259736.

The spelling of 81837076 in words is "eighty-one million, eight hundred thirty-seven thousand, seventy-six".