81114880 has 144 divisors (see below), whose sum is σ = 242532864. Its totient is φ = 25251840.

The previous prime is 81114877. The next prime is 81114883. The reversal of 81114880 is 8841118.

It is an interprime number because it is at equal distance from previous prime (81114877) and next prime (81114883).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81114883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98149 + ... + 98971.

It is an arithmetic number, because the mean of its divisors is an integer number (1684256).

Almost surely, 2^81114880 is an apocalyptic number.

81114880 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81114880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121266432).

81114880 is an abundant number, since it is smaller than the sum of its proper divisors (161417984).

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

81114880 is a wasteful number, since it uses less digits than its factorization.

81114880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862 (or 848 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 31.

The square root of 81114880 is about 9006.3799608944. The cubic root of 81114880 is about 432.8793246271.

Adding to 81114880 its reverse (8841118), we get a palindrome (89955998).

The spelling of 81114880 in words is "eighty-one million, one hundred fourteen thousand, eight hundred eighty".