71656225 has 9 divisors (see below), whose sum is σ = 88906233. Its totient is φ = 57291120.

The previous prime is 71656223. The next prime is 71656231. The reversal of 71656225 is 52265617.

The square root of 71656225 is 8465.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 4809249 + 66846976 = 2193^2 + 8176^2 .

It is not a de Polignac number, because 71656225 - 2¹ = 71656223 is a prime.

It is a super-2 number, since 2×71656225² = 10269229162501250, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71656223) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 41479 + ... + 43171.

Almost surely, 2^71656225 is an apocalyptic number.

71656225 is the 8465-th square number.

71656225 is the 4233-rd centered octagonal number.

It is an amenable number.

71656225 is a deficient number, since it is larger than the sum of its proper divisors (17250008).

71656225 is an frugal number, since it uses more digits than its factorization.

71656225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3396 (or 1698 counting only the distinct ones).

The product of its digits is 25200, while the sum is 34.

The cubic root of 71656225 is about 415.3535961545.

The spelling of 71656225 in words is "seventy-one million, six hundred fifty-six thousand, two hundred twenty-five".