81214298838 has 64 divisors (see below), whose sum is σ = 183549995520. Its totient is φ = 26612045856.

The previous prime is 81214298831. The next prime is 81214298903. The reversal of 81214298838 is 83889241218.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81214298831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1738920 + ... + 1785012.

It is an arithmetic number, because the mean of its divisors is an integer number (2867968680).

Almost surely, 2^81214298838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81214298838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91774997760).

81214298838 is an abundant number, since it is smaller than the sum of its proper divisors (102335696682).

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

81214298838 is a wasteful number, since it uses less digits than its factorization.

81214298838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46658 (or 46652 counting only the distinct ones).

The product of its digits is 1769472, while the sum is 54.

The spelling of 81214298838 in words is "eighty-one billion, two hundred fourteen million, two hundred ninety-eight thousand, eight hundred thirty-eight".