81027620874 has 48 divisors (see below), whose sum is σ = 183539678400. Its totient is φ = 25834823784.

The previous prime is 81027620831. The next prime is 81027620879. The reversal of 81027620874 is 47802672018.

81027620874 is a `hidden beast` number, since 8 + 10 + 2 + 7 + 620 + 8 + 7 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (81027620879) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34017 + ... + 403995.

It is an arithmetic number, because the mean of its divisors is an integer number (3823743300).

Almost surely, 2^81027620874 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81027620874, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91769839200).

81027620874 is an abundant number, since it is smaller than the sum of its proper divisors (102512057526).

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

81027620874 is a wasteful number, since it uses less digits than its factorization.

81027620874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370056 (or 370007 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 45.

The spelling of 81027620874 in words is "eighty-one billion, twenty-seven million, six hundred twenty thousand, eight hundred seventy-four".