81087637 has 8 divisors (see below), whose sum is σ = 87854976. Its totient is φ = 74542272.

The previous prime is 81087631. The next prime is 81087641. The reversal of 81087637 is 73678018.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81087637 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81087637.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81087631) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 54733 + ... + 56194.

It is an arithmetic number, because the mean of its divisors is an integer number (10981872).

Almost surely, 2^81087637 is an apocalyptic number.

It is an amenable number.

81087637 is a deficient number, since it is larger than the sum of its proper divisors (6767339).

81087637 is a wasteful number, since it uses less digits than its factorization.

81087637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110987.

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

The square root of 81087637 is about 9004.8674060199. The cubic root of 81087637 is about 432.8308573506.

The spelling of 81087637 in words is "eighty-one million, eighty-seven thousand, six hundred thirty-seven".