71530640 has 40 divisors (see below), whose sum is σ = 171679488. Its totient is φ = 27688320.

The previous prime is 71530637. The next prime is 71530673. The reversal of 71530640 is 4603517.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11942 + ... + 16901.

Almost surely, 2^71530640 is an apocalyptic number.

It is an amenable number.

71530640 is an abundant number, since it is smaller than the sum of its proper divisors (100148848).

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

71530640 is a wasteful number, since it uses less digits than its factorization.

71530640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28887 (or 28881 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 71530640 is about 8457.5788497655. The cubic root of 71530640 is about 415.1108041091.

The spelling of 71530640 in words is "seventy-one million, five hundred thirty thousand, six hundred forty".