71071645 has 8 divisors (see below), whose sum is σ = 90302904. Its totient is φ = 53512704.

The previous prime is 71071621. The next prime is 71071667. The reversal of 71071645 is 54617017.

It can be written as a sum of positive squares in 4 ways, for example, as 28847641 + 42224004 = 5371^2 + 6498^2 .

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 71071645 - 2¹¹ = 71069597 is a prime.

It is a Duffinian number.

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, 417984 + ... + 418153.

It is an arithmetic number, because the mean of its divisors is an integer number (11287863).

Almost surely, 2^71071645 is an apocalyptic number.

It is an amenable number.

71071645 is a deficient number, since it is larger than the sum of its proper divisors (19231259).

71071645 is a wasteful number, since it uses less digits than its factorization.

71071645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836159.

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 71071645 is about 8430.4000498197. The cubic root of 71071645 is about 414.2210092876.

The spelling of 71071645 in words is "seventy-one million, seventy-one thousand, six hundred forty-five".