81234277420 has 48 divisors (see below), whose sum is σ = 176727096000. Its totient is φ = 31328326400.

The previous prime is 81234277417. The next prime is 81234277427. The reversal of 81234277420 is 2477243218.

It is not an unprimeable number, because it can be changed into a prime (81234277427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 306681 + ... + 506479.

It is an arithmetic number, because the mean of its divisors is an integer number (3681814500).

Almost surely, 2^81234277420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81234277420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88363548000).

81234277420 is an abundant number, since it is smaller than the sum of its proper divisors (95492818580).

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

81234277420 is a wasteful number, since it uses less digits than its factorization.

81234277420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200538 (or 200536 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 40.

The spelling of 81234277420 in words is "eighty-one billion, two hundred thirty-four million, two hundred seventy-seven thousand, four hundred twenty".