81474436740 has 24 divisors (see below), whose sum is σ = 228128423040. Its totient is φ = 21726516448.

The previous prime is 81474436739. The next prime is 81474436783. The reversal of 81474436740 is 4763447418.

It is a self number, because there is not a number n which added to its sum of digits gives 81474436740.

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, 678953580 + ... + 678953699.

It is an arithmetic number, because the mean of its divisors is an integer number (9505350960).

Almost surely, 2^81474436740 is an apocalyptic number.

It is an amenable number.

81474436740 is an abundant number, since it is smaller than the sum of its proper divisors (146653986300).

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

81474436740 is a wasteful number, since it uses less digits than its factorization.

81474436740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357907291 (or 1357907289 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 48.

The spelling of 81474436740 in words is "eighty-one billion, four hundred seventy-four million, four hundred thirty-six thousand, seven hundred forty".