71147657 has 12 divisors (see below), whose sum is σ = 83622420. Its totient is φ = 60350976.

The previous prime is 71147641. The next prime is 71147689. The reversal of 71147657 is 75674117.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10010896 + 61136761 = 3164^2 + 7819^2 .

It is not a de Polignac number, because 71147657 - 2⁴ = 71147641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71147657.

It is not an unprimeable number, because it can be changed into a prime (71147957) 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 11 ways as a sum of consecutive naturals, for example, 2732 + ... + 12237.

It is an arithmetic number, because the mean of its divisors is an integer number (6968535).

Almost surely, 2^71147657 is an apocalyptic number.

It is an amenable number.

71147657 is a deficient number, since it is larger than the sum of its proper divisors (12474763).

71147657 is a wasteful number, since it uses less digits than its factorization.

71147657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15080 (or 15073 counting only the distinct ones).

The product of its digits is 41160, while the sum is 38.

The square root of 71147657 is about 8434.9070534298. The cubic root of 71147657 is about 414.3686281644.

The spelling of 71147657 in words is "seventy-one million, one hundred forty-seven thousand, six hundred fifty-seven".