71523520 has 56 divisors (see below), whose sum is σ = 171047664. Its totient is φ = 28486656.

The previous prime is 71523503. The next prime is 71523523. The reversal of 71523520 is 2532517.

It is a super-2 number, since 2×71523520² = 10231227826380800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71523523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126759 + ... + 127321.

Almost surely, 2^71523520 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 71523520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85523832).

71523520 is an abundant number, since it is smaller than the sum of its proper divisors (99524144).

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

71523520 is a wasteful number, since it uses less digits than its factorization.

71523520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977 (or 967 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 71523520 is about 8457.1579150445. The cubic root of 71523520 is about 415.0970305850.

The spelling of 71523520 in words is "seventy-one million, five hundred twenty-three thousand, five hundred twenty".