81464227838 has 24 divisors (see below), whose sum is σ = 142336170144. Its totient is φ = 34866720000.

The previous prime is 81464227811. The next prime is 81464227847. The reversal of 81464227838 is 83872246418.

It is a self number, because there is not a number n which added to its sum of digits gives 81464227838.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 479843 + ... + 627038.

It is an arithmetic number, because the mean of its divisors is an integer number (5930673756).

Almost surely, 2^81464227838 is an apocalyptic number.

81464227838 is a deficient number, since it is larger than the sum of its proper divisors (60871942306).

81464227838 is a wasteful number, since it uses less digits than its factorization.

81464227838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107648 (or 1107641 counting only the distinct ones).

The product of its digits is 4128768, while the sum is 53.

The spelling of 81464227838 in words is "eighty-one billion, four hundred sixty-four million, two hundred twenty-seven thousand, eight hundred thirty-eight".