80731638040 has 32 divisors (see below), whose sum is σ = 181656594000. Its totient is φ = 32290804864.

The previous prime is 80731638019. The next prime is 80731638047. The reversal of 80731638040 is 4083613708.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 80731637984 and 80731638002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80731638047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 809646 + ... + 903874.

Almost surely, 2^80731638040 is an apocalyptic number.

It is an amenable number.

80731638040 is an abundant number, since it is smaller than the sum of its proper divisors (100924955960).

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

80731638040 is a wasteful number, since it uses less digits than its factorization.

80731638040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115659 (or 115655 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The spelling of 80731638040 in words is "eighty billion, seven hundred thirty-one million, six hundred thirty-eight thousand, forty".