71730520 has 16 divisors (see below), whose sum is σ = 161393760. Its totient is φ = 28692192.

The previous prime is 71730473. The next prime is 71730541. The reversal of 71730520 is 2503717.

It is a congruent number.

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, 896592 + ... + 896671.

It is an arithmetic number, because the mean of its divisors is an integer number (10087110).

Almost surely, 2^71730520 is an apocalyptic number.

It is an amenable number.

71730520 is an abundant number, since it is smaller than the sum of its proper divisors (89663240).

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

71730520 is a wasteful number, since it uses less digits than its factorization.

71730520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1793274 (or 1793270 counting only the distinct ones).

The product of its (nonzero) digits is 1470, while the sum is 25.

The square root of 71730520 is about 8469.3872269486. The cubic root of 71730520 is about 415.4970963019.

The spelling of 71730520 in words is "seventy-one million, seven hundred thirty thousand, five hundred twenty".