71643725 has 6 divisors (see below), whose sum is σ = 88838250. Its totient is φ = 57314960.

The previous prime is 71643713. The next prime is 71643731. The reversal of 71643725 is 52734617.

It can be written as a sum of positive squares in 3 ways, for example, as 9375844 + 62267881 = 3062^2 + 7891^2 .

It is not a de Polignac number, because 71643725 - 2²⁶ = 4534861 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1432850 + ... + 1432899.

It is an arithmetic number, because the mean of its divisors is an integer number (14806375).

Almost surely, 2^71643725 is an apocalyptic number.

It is an amenable number.

71643725 is a deficient number, since it is larger than the sum of its proper divisors (17194525).

71643725 is a wasteful number, since it uses less digits than its factorization.

71643725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2865759 (or 2865754 counting only the distinct ones).

The product of its digits is 35280, while the sum is 35.

The square root of 71643725 is about 8464.2616334799. The cubic root of 71643725 is about 415.3294427662.

The spelling of 71643725 in words is "seventy-one million, six hundred forty-three thousand, seven hundred twenty-five".