81378285862 has 8 divisors (see below), whose sum is σ = 122349341016. Its totient is φ = 40595172192.

The previous prime is 81378285853. The next prime is 81378285869. The reversal of 81378285862 is 26858287318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 81378285797 and 81378285806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81378285869) 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, 46984288 + ... + 46986019.

It is an arithmetic number, because the mean of its divisors is an integer number (15293667627).

Almost surely, 2^81378285862 is an apocalyptic number.

81378285862 is a deficient number, since it is larger than the sum of its proper divisors (40971055154).

81378285862 is a wasteful number, since it uses less digits than its factorization.

81378285862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93970742.

The product of its digits is 10321920, while the sum is 58.

The spelling of 81378285862 in words is "eighty-one billion, three hundred seventy-eight million, two hundred eighty-five thousand, eight hundred sixty-two".