81087032740 has 96 divisors (see below), whose sum is σ = 197950685184. Its totient is φ = 27325710720.

The previous prime is 81087032737. The next prime is 81087032743. The reversal of 81087032740 is 4723078018.

It is an interprime number because it is at equal distance from previous prime (81087032737) and next prime (81087032743).

It is a super-3 number, since 3×81087032740³ (a number of 34 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81087032693 and 81087032702.

It is not an unprimeable number, because it can be changed into a prime (81087032743) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4333605 + ... + 4352275.

It is an arithmetic number, because the mean of its divisors is an integer number (2061986304).

Almost surely, 2^81087032740 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81087032740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98975342592).

81087032740 is an abundant number, since it is smaller than the sum of its proper divisors (116863652444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81087032740 is a wasteful number, since it uses less digits than its factorization.

81087032740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19217 (or 19215 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 40.

The spelling of 81087032740 in words is "eighty-one billion, eighty-seven million, thirty-two thousand, seven hundred forty".