71526640 has 40 divisors (see below), whose sum is σ = 175055760. Its totient is φ = 27104256.

The previous prime is 71526629. The next prime is 71526643. The reversal of 71526640 is 4662517.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71526643) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 22009 + ... + 25048.

It is an arithmetic number, because the mean of its divisors is an integer number (4376394).

Almost surely, 2^71526640 is an apocalyptic number.

It is an amenable number.

71526640 is an abundant number, since it is smaller than the sum of its proper divisors (103529120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71526640 is a wasteful number, since it uses less digits than its factorization.

71526640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47089 (or 47083 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 71526640 is about 8457.3423721640. The cubic root of 71526640 is about 415.1030662867.

The spelling of 71526640 in words is "seventy-one million, five hundred twenty-six thousand, six hundred forty".