81837948 has 12 divisors (see below), whose sum is σ = 190955240. Its totient is φ = 27279312.

The previous prime is 81837947. The next prime is 81837953. The reversal of 81837948 is 84973818.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 81837897 and 81837906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81837947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3409903 + ... + 3409926.

Almost surely, 2^81837948 is an apocalyptic number.

It is an amenable number.

81837948 is an abundant number, since it is smaller than the sum of its proper divisors (109117292).

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

81837948 is a wasteful number, since it uses less digits than its factorization.

81837948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6819836 (or 6819834 counting only the distinct ones).

The product of its digits is 387072, while the sum is 48.

The square root of 81837948 is about 9046.4328881609. The cubic root of 81837948 is about 434.1617680065.

The spelling of 81837948 in words is "eighty-one million, eight hundred thirty-seven thousand, nine hundred forty-eight".