81000876 has 48 divisors (see below), whose sum is σ = 217042560. Its totient is φ = 23253120.

The previous prime is 81000859. The next prime is 81000893. The reversal of 81000876 is 67800018.

It is an interprime number because it is at equal distance from previous prime (81000859) and next prime (81000893).

It is a super-2 number, since 2×81000876² = 13122283825534752, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13641 + ... + 18656.

It is an arithmetic number, because the mean of its divisors is an integer number (4521720).

Almost surely, 2^81000876 is an apocalyptic number.

It is an amenable number.

81000876 is an abundant number, since it is smaller than the sum of its proper divisors (136041684).

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

81000876 is a wasteful number, since it uses less digits than its factorization.

81000876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32334 (or 32332 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 81000876 is about 9000.0486665351. The cubic root of 81000876 is about 432.6764308528.

It can be divided in two parts, 8 and 1000876, that multiplied together give a palindrome (8007008).

The spelling of 81000876 in words is "eighty-one million, eight hundred seventy-six", and thus it is an aban number.