81848130 has 96 divisors (see below), whose sum is σ = 246141504. Its totient is φ = 17265024.

The previous prime is 81848119. The next prime is 81848131. The reversal of 81848130 is 3184818.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81848091 and 81848100.

It is not an unprimeable number, because it can be changed into a prime (81848131) 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, 16969 + ... + 21251.

It is an arithmetic number, because the mean of its divisors is an integer number (2563974).

Almost surely, 2^81848130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81848130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123070752).

81848130 is an abundant number, since it is smaller than the sum of its proper divisors (164293374).

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

81848130 is a wasteful number, since it uses less digits than its factorization.

81848130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4320 (or 4313 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 81848130 is about 9046.9956339107. The cubic root of 81848130 is about 434.1797729048.

The spelling of 81848130 in words is "eighty-one million, eight hundred forty-eight thousand, one hundred thirty".