81078303620 has 12 divisors (see below), whose sum is σ = 170264437644. Its totient is φ = 32431321440.

The previous prime is 81078303569. The next prime is 81078303623. The reversal of 81078303620 is 2630387018.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19048416256 + 62029887364 = 138016^2 + 249058^2 .

It is not an unprimeable number, because it can be changed into a prime (81078303623) 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, 2026957571 + ... + 2026957610.

It is an arithmetic number, because the mean of its divisors is an integer number (14188703137).

Almost surely, 2^81078303620 is an apocalyptic number.

It is an amenable number.

81078303620 is an abundant number, since it is smaller than the sum of its proper divisors (89186134024).

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

81078303620 is a wasteful number, since it uses less digits than its factorization.

81078303620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4053915190 (or 4053915188 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The spelling of 81078303620 in words is "eighty-one billion, seventy-eight million, three hundred three thousand, six hundred twenty".