89681688987 has 48 divisors (see below), whose sum is σ = 138092505600. Its totient is φ = 51330502080.

The previous prime is 89681688961. The next prime is 89681688997. The reversal of 89681688987 is 78988618698.

It is not a de Polignac number, because 89681688987 - 2¹² = 89681684891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (89681688907) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1346589 + ... + 1411617.

It is an arithmetic number, because the mean of its divisors is an integer number (2876927200).

Almost surely, 2^89681688987 is an apocalyptic number.

89681688987 is a deficient number, since it is larger than the sum of its proper divisors (48410816613).

89681688987 is a wasteful number, since it uses less digits than its factorization.

89681688987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65168 (or 65145 counting only the distinct ones).

The product of its digits is 668860416, while the sum is 78.

The spelling of 89681688987 in words is "eighty-nine billion, six hundred eighty-one million, six hundred eighty-eight thousand, nine hundred eighty-seven".