81063980 has 24 divisors (see below), whose sum is σ = 170514288. Its totient is φ = 32372288.

The previous prime is 81063947. The next prime is 81064001. The reversal of 81063980 is 8936018.

It is a self number, because there is not a number n which added to its sum of digits gives 81063980.

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, 10547 + ... + 16533.

It is an arithmetic number, because the mean of its divisors is an integer number (7104762).

Almost surely, 2^81063980 is an apocalyptic number.

It is an amenable number.

81063980 is an abundant number, since it is smaller than the sum of its proper divisors (89450308).

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

81063980 is a wasteful number, since it uses less digits than its factorization.

81063980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6673 (or 6671 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 81063980 is about 9003.5537428284. The cubic root of 81063980 is about 432.7887610217.

Adding to 81063980 its reverse (8936018), we get a palindrome (89999998).

The spelling of 81063980 in words is "eighty-one million, sixty-three thousand, nine hundred eighty".