81948748 has 48 divisors (see below), whose sum is σ = 178124800. Its totient is φ = 32192640.

The previous prime is 81948733. The next prime is 81948749. The reversal of 81948748 is 84784918.

It is not an unprimeable number, because it can be changed into a prime (81948749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14008 + ... + 18976.

Almost surely, 2^81948748 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 81948748, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89062400).

81948748 is an abundant number, since it is smaller than the sum of its proper divisors (96176052).

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

81948748 is a wasteful number, since it uses less digits than its factorization.

81948748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5030 (or 5028 counting only the distinct ones).

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

The square root of 81948748 is about 9052.5547775200. The cubic root of 81948748 is about 434.3576161495.

The spelling of 81948748 in words is "eighty-one million, nine hundred forty-eight thousand, seven hundred forty-eight".