71880385 has 4 divisors (see below), whose sum is σ = 86256468. Its totient is φ = 57504304.

The previous prime is 71880383. The next prime is 71880397. The reversal of 71880385 is 58308817.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34999056 + 36881329 = 5916^2 + 6073^2 .

It is a cyclic number.

It is not a de Polignac number, because 71880385 - 2¹ = 71880383 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71880383) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7188034 + ... + 7188043.

It is an arithmetic number, because the mean of its divisors is an integer number (21564117).

Almost surely, 2^71880385 is an apocalyptic number.

It is an amenable number.

71880385 is a deficient number, since it is larger than the sum of its proper divisors (14376083).

71880385 is a wasteful number, since it uses less digits than its factorization.

71880385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14376082.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 71880385 is about 8478.2300629318. The cubic root of 71880385 is about 415.7862580014.

The spelling of 71880385 in words is "seventy-one million, eight hundred eighty thousand, three hundred eighty-five".