71513645 has 32 divisors (see below), whose sum is σ = 104467968. Its totient is φ = 45877248.

The previous prime is 71513639. The next prime is 71513669. The reversal of 71513645 is 54631517.

It is a cyclic number.

It is not a de Polignac number, because 71513645 - 2⁶ = 71513581 is a prime.

It is a super-3 number, since 3×71513645³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 156257 + ... + 156713.

It is an arithmetic number, because the mean of its divisors is an integer number (3264624).

Almost surely, 2^71513645 is an apocalyptic number.

It is an amenable number.

71513645 is a deficient number, since it is larger than the sum of its proper divisors (32954323).

71513645 is a wasteful number, since it uses less digits than its factorization.

71513645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749.

The product of its digits is 12600, while the sum is 32.

The square root of 71513645 is about 8456.5740699174. The cubic root of 71513645 is about 415.0779260450.

The spelling of 71513645 in words is "seventy-one million, five hundred thirteen thousand, six hundred forty-five".