81227374438 has 16 divisors (see below), whose sum is σ = 139306212864. Its totient is φ = 34796910600.

The previous prime is 81227374421. The next prime is 81227374447. The reversal of 81227374438 is 83447372218.

It is a junction number, because it is equal to n+sod(n) for n = 81227374391 and 81227374400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1201020 + ... + 1266847.

It is an arithmetic number, because the mean of its divisors is an integer number (8706638304).

Almost surely, 2^81227374438 is an apocalyptic number.

81227374438 is a deficient number, since it is larger than the sum of its proper divisors (58078838426).

81227374438 is a wasteful number, since it uses less digits than its factorization.

81227374438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2470227.

The product of its digits is 1806336, while the sum is 49.

The spelling of 81227374438 in words is "eighty-one billion, two hundred twenty-seven million, three hundred seventy-four thousand, four hundred thirty-eight".