80138781 has 32 divisors (see below), whose sum is σ = 123338880. Its totient is φ = 51383808.

The previous prime is 80138777. The next prime is 80138797. The reversal of 80138781 is 18783108.

It is not a de Polignac number, because 80138781 - 2² = 80138777 is a prime.

It is a super-2 number, since 2×80138781² = 12844448440331922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80138701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 96490 + ... + 97316.

It is an arithmetic number, because the mean of its divisors is an integer number (3854340).

Almost surely, 2^80138781 is an apocalyptic number.

It is an amenable number.

80138781 is a deficient number, since it is larger than the sum of its proper divisors (43200099).

80138781 is a wasteful number, since it uses less digits than its factorization.

80138781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970 (or 964 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The square root of 80138781 is about 8952.0266420515. The cubic root of 80138781 is about 431.1359562333.

The spelling of 80138781 in words is "eighty million, one hundred thirty-eight thousand, seven hundred eighty-one".