71578340 has 12 divisors (see below), whose sum is σ = 150314556. Its totient is φ = 28631328.

The previous prime is 71578289. The next prime is 71578363. The reversal of 71578340 is 4387517.

It can be written as a sum of positive squares in 2 ways, for example, as 7929856 + 63648484 = 2816^2 + 7978^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 71578340.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1789439 + ... + 1789478.

It is an arithmetic number, because the mean of its divisors is an integer number (12526213).

Almost surely, 2^71578340 is an apocalyptic number.

It is an amenable number.

71578340 is an abundant number, since it is smaller than the sum of its proper divisors (78736216).

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

71578340 is a wasteful number, since it uses less digits than its factorization.

71578340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3578926 (or 3578924 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 71578340 is about 8460.3983357759. The cubic root of 71578340 is about 415.2030554186.

The spelling of 71578340 in words is "seventy-one million, five hundred seventy-eight thousand, three hundred forty".