71028641 has 4 divisors (see below), whose sum is σ = 72948372. Its totient is φ = 69108912.

The previous prime is 71028611. The next prime is 71028689. The reversal of 71028641 is 14682017.

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 44609041 + 26419600 = 6679^2 + 5140^2 .

It is a cyclic number.

It is not a de Polignac number, because 71028641 - 2¹⁴ = 71012257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71028611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 959810 + ... + 959883.

It is an arithmetic number, because the mean of its divisors is an integer number (18237093).

Almost surely, 2^71028641 is an apocalyptic number.

It is an amenable number.

71028641 is a deficient number, since it is larger than the sum of its proper divisors (1919731).

71028641 is a wasteful number, since it uses less digits than its factorization.

71028641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1919730.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 71028641 is about 8427.8491324893. The cubic root of 71028641 is about 414.1374468754.

The spelling of 71028641 in words is "seventy-one million, twenty-eight thousand, six hundred forty-one".