80781056440 has 64 divisors (see below), whose sum is σ = 209779450560. Its totient is φ = 27422131200.

The previous prime is 80781056423. The next prime is 80781056441. The reversal of 80781056440 is 4465018708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80781056441) 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, 1399957 + ... + 1456516.

It is an arithmetic number, because the mean of its divisors is an integer number (3277803915).

Almost surely, 2^80781056440 is an apocalyptic number.

It is an amenable number.

80781056440 is an abundant number, since it is smaller than the sum of its proper divisors (128998394120).

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

80781056440 is a wasteful number, since it uses less digits than its factorization.

80781056440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2856592 (or 2856588 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 43.

The spelling of 80781056440 in words is "eighty billion, seven hundred eighty-one million, fifty-six thousand, four hundred forty".