81023278050 has 192 divisors, whose sum is σ = 262296961920. Its totient is φ = 18131040000.

The previous prime is 81023278027. The next prime is 81023278057. The reversal of 81023278050 is 5087232018.

It is a super-2 number, since 2×81023278050² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81023277996 and 81023278014.

It is not an unprimeable number, because it can be changed into a prime (81023278057) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 16801 + ... + 402900.

It is an arithmetic number, because the mean of its divisors is an integer number (1366130010).

Almost surely, 2^81023278050 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81023278050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131148480960).

81023278050 is an abundant number, since it is smaller than the sum of its proper divisors (181273683870).

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

81023278050 is a wasteful number, since it uses less digits than its factorization.

81023278050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419746 (or 419735 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The spelling of 81023278050 in words is "eighty-one billion, twenty-three million, two hundred seventy-eight thousand, fifty".