81847948 has 48 divisors (see below), whose sum is σ = 178827264. Its totient is φ = 31913280.

The previous prime is 81847943. The next prime is 81847949. The reversal of 81847948 is 84974818.

It is not an unprimeable number, because it can be changed into a prime (81847943) 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, 24261 + ... + 27427.

It is an arithmetic number, because the mean of its divisors is an integer number (3725568).

Almost surely, 2^81847948 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 81847948, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89413632).

81847948 is an abundant number, since it is smaller than the sum of its proper divisors (96979316).

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

81847948 is a wasteful number, since it uses less digits than its factorization.

81847948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3262 (or 3260 counting only the distinct ones).

The product of its digits is 516096, while the sum is 49.

The square root of 81847948 is about 9046.9855753173. The cubic root of 81847948 is about 434.1794510861.

The spelling of 81847948 in words is "eighty-one million, eight hundred forty-seven thousand, nine hundred forty-eight".