71523720 has 96 divisors (see below), whose sum is σ = 236335320. Its totient is φ = 18754560.

The previous prime is 71523713. The next prime is 71523737. The reversal of 71523720 is 2732517.

71523720 is a `hidden beast` number, since 71 + 523 + 72 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 50893956 + 20629764 = 7134^2 + 4542^2 .

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 20332 + ... + 23588.

Almost surely, 2^71523720 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 71523720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118167660).

71523720 is an abundant number, since it is smaller than the sum of its proper divisors (164811600).

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

71523720 is a wasteful number, since it uses less digits than its factorization.

71523720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3335 (or 3328 counting only the distinct ones).

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

The square root of 71523720 is about 8457.1697393395. The cubic root of 71523720 is about 415.0974174942.

The spelling of 71523720 in words is "seventy-one million, five hundred twenty-three thousand, seven hundred twenty".