81835968 has 28 divisors (see below), whose sum is σ = 216524840. Its totient is φ = 27278592.

The previous prime is 81835961. The next prime is 81835981. The reversal of 81835968 is 86953818.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81835961) 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, 212923 + ... + 213306.

It is an arithmetic number, because the mean of its divisors is an integer number (7733030).

Almost surely, 2^81835968 is an apocalyptic number.

It is an amenable number.

81835968 is an abundant number, since it is smaller than the sum of its proper divisors (134688872).

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

81835968 is a wasteful number, since it uses less digits than its factorization.

81835968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426244 (or 426234 counting only the distinct ones).

The product of its digits is 414720, while the sum is 48.

The square root of 81835968 is about 9046.3234520992. The cubic root of 81835968 is about 434.1582665859.

The spelling of 81835968 in words is "eighty-one million, eight hundred thirty-five thousand, nine hundred sixty-eight".