81238926874 has 16 divisors (see below), whose sum is σ = 144069033600. Its totient is φ = 33616107504.

The previous prime is 81238926871. The next prime is 81238926877. The reversal of 81238926874 is 47862983218.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81238926871) and next prime (81238926877).

It is a Harshad number since it is a multiple of its sum of digits (58).

It is not an unprimeable number, because it can be changed into a prime (81238926871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100047534 + ... + 100048345.

It is an arithmetic number, because the mean of its divisors is an integer number (9004314600).

Almost surely, 2^81238926874 is an apocalyptic number.

81238926874 is a deficient number, since it is larger than the sum of its proper divisors (62830106726).

81238926874 is a wasteful number, since it uses less digits than its factorization.

81238926874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200095917.

The product of its digits is 9289728, while the sum is 58.

The spelling of 81238926874 in words is "eighty-one billion, two hundred thirty-eight million, nine hundred twenty-six thousand, eight hundred seventy-four".