71387755 has 8 divisors (see below), whose sum is σ = 86497632. Its totient is φ = 56555328.

The previous prime is 71387713. The next prime is 71387779. The reversal of 71387755 is 55778317.

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 71387755 - 2¹¹ = 71385707 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68794 + ... + 69823.

It is an arithmetic number, because the mean of its divisors is an integer number (10812204).

Almost surely, 2^71387755 is an apocalyptic number.

71387755 is a deficient number, since it is larger than the sum of its proper divisors (15109877).

71387755 is a wasteful number, since it uses less digits than its factorization.

71387755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138725.

The product of its digits is 205800, while the sum is 43.

The square root of 71387755 is about 8449.1274697450. The cubic root of 71387755 is about 414.8342203287.

The spelling of 71387755 in words is "seventy-one million, three hundred eighty-seven thousand, seven hundred fifty-five".