71865225 has 60 divisors (see below), whose sum is σ = 138997056. Its totient is φ = 36637920.

The previous prime is 71865203. The next prime is 71865247. The reversal of 71865225 is 52256817.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (71865203) and next prime (71865247).

It is not a de Polignac number, because 71865225 - 2⁵ = 71865193 is a prime.

It is a super-2 number, since 2×71865225² = 10329221128601250, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 71865225.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 45804 + ... + 47346.

Almost surely, 2^71865225 is an apocalyptic number.

71865225 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

71865225 is a deficient number, since it is larger than the sum of its proper divisors (67131831).

71865225 is a wasteful number, since it uses less digits than its factorization.

71865225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1588 (or 1574 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 71865225 is about 8477.3359612558. The cubic root of 71865225 is about 415.7570253493.

The spelling of 71865225 in words is "seventy-one million, eight hundred sixty-five thousand, two hundred twenty-five".