71723520 has 240 divisors, whose sum is σ = 271937952. Its totient is φ = 17326080.

The previous prime is 71723507. The next prime is 71723539. The reversal of 71723520 is 2532717.

71723520 is a `hidden beast` number, since 71 + 72 + 3 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 253299 + ... + 253581.

Almost surely, 2^71723520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71723520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135968976).

71723520 is an abundant number, since it is smaller than the sum of its proper divisors (200214432).

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

71723520 is a wasteful number, since it uses less digits than its factorization.

71723520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323 (or 304 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 71723520 is about 8468.9739638282. The cubic root of 71723520 is about 415.4835800920.

The spelling of 71723520 in words is "seventy-one million, seven hundred twenty-three thousand, five hundred twenty".