71781055 has 8 divisors (see below), whose sum is σ = 91204272. Its totient is φ = 54046848.

The previous prime is 71781049. The next prime is 71781077. The reversal of 71781055 is 55018717.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71781055 - 2¹³ = 71772863 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71781055.

It is a congruent number.

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, 422157 + ... + 422326.

It is an arithmetic number, because the mean of its divisors is an integer number (11400534).

Almost surely, 2^71781055 is an apocalyptic number.

71781055 is a deficient number, since it is larger than the sum of its proper divisors (19423217).

71781055 is a wasteful number, since it uses less digits than its factorization.

71781055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844505.

The product of its (nonzero) digits is 9800, while the sum is 34.

The square root of 71781055 is about 8472.3700934272. The cubic root of 71781055 is about 415.5946476035.

The spelling of 71781055 in words is "seventy-one million, seven hundred eighty-one thousand, fifty-five".