71228657 has 8 divisors (see below), whose sum is σ = 75648456. Its totient is φ = 66834432.

The previous prime is 71228627. The next prime is 71228659. The reversal of 71228657 is 75682217.

It can be written as a sum of positive squares in 4 ways, for example, as 3182656 + 68046001 = 1784^2 + 8249^2 .

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 71228657 - 2¹² = 71224561 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71228657.

It is not an unprimeable number, because it can be changed into a prime (71228659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 488 + ... + 11945.

It is an arithmetic number, because the mean of its divisors is an integer number (9456057).

Almost surely, 2^71228657 is an apocalyptic number.

It is an amenable number.

71228657 is a deficient number, since it is larger than the sum of its proper divisors (4419799).

71228657 is a wasteful number, since it uses less digits than its factorization.

71228657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12787.

The product of its digits is 47040, while the sum is 38.

The square root of 71228657 is about 8439.7071631663. The cubic root of 71228657 is about 414.5258183007.

The spelling of 71228657 in words is "seventy-one million, two hundred twenty-eight thousand, six hundred fifty-seven".