81473400140 has 48 divisors (see below), whose sum is σ = 187690970880. Its totient is φ = 29461164480.

The previous prime is 81473400121. The next prime is 81473400143. The reversal of 81473400140 is 4100437418.

It is a junction number, because it is equal to n+sod(n) for n = 81473400097 and 81473400106.

It is not an unprimeable number, because it can be changed into a prime (81473400143) 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, 995072 + ... + 1073831.

It is an arithmetic number, because the mean of its divisors is an integer number (3910228560).

Almost surely, 2^81473400140 is an apocalyptic number.

It is an amenable number.

81473400140 is an abundant number, since it is smaller than the sum of its proper divisors (106217570740).

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

81473400140 is a wasteful number, since it uses less digits than its factorization.

81473400140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2069102 (or 2069100 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

Adding to 81473400140 its reverse (4100437418), we get a palindrome (85573837558).

The spelling of 81473400140 in words is "eighty-one billion, four hundred seventy-three million, four hundred thousand, one hundred forty".