81960768 has 56 divisors (see below), whose sum is σ = 240954560. Its totient is φ = 27319680.

The previous prime is 81960733. The next prime is 81960773. The reversal of 81960768 is 86706918.

It is a happy number.

It is a super-2 number, since 2×81960768² = 13435134982299648, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21988 + ... + 25443.

It is an arithmetic number, because the mean of its divisors is an integer number (4302760).

Almost surely, 2^81960768 is an apocalyptic number.

It is an amenable number.

81960768 is an abundant number, since it is smaller than the sum of its proper divisors (158993792).

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

81960768 is a wasteful number, since it uses less digits than its factorization.

81960768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47452 (or 47436 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 81960768 is about 9053.2186541583. The cubic root of 81960768 is about 434.3788518748.

It can be divided in two parts, 81960 and 768, that added together give a palindrome (82728).

The spelling of 81960768 in words is "eighty-one million, nine hundred sixty thousand, seven hundred sixty-eight".