71256385 has 4 divisors (see below), whose sum is σ = 85507668. Its totient is φ = 57005104.

The previous prime is 71256359. The next prime is 71256391. The reversal of 71256385 is 58365217.

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 37662769 + 33593616 = 6137^2 + 5796^2 .

It is a cyclic number.

It is not a de Polignac number, because 71256385 - 2⁷ = 71256257 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7125634 + ... + 7125643.

It is an arithmetic number, because the mean of its divisors is an integer number (21376917).

Almost surely, 2^71256385 is an apocalyptic number.

It is an amenable number.

71256385 is a deficient number, since it is larger than the sum of its proper divisors (14251283).

71256385 is a wasteful number, since it uses less digits than its factorization.

71256385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14251282.

The product of its digits is 50400, while the sum is 37.

The square root of 71256385 is about 8441.3497143526. The cubic root of 71256385 is about 414.5796004030.

The spelling of 71256385 in words is "seventy-one million, two hundred fifty-six thousand, three hundred eighty-five".