71915520 has 96 divisors (see below), whose sum is σ = 230171760. Its totient is φ = 19169280.

The previous prime is 71915507. The next prime is 71915521. The reversal of 71915520 is 2551917.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71915521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29550 + ... + 31890.

Almost surely, 2^71915520 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 71915520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115085880).

71915520 is an abundant number, since it is smaller than the sum of its proper divisors (158256240).

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

71915520 is a wasteful number, since it uses less digits than its factorization.

71915520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2371 (or 2351 counting only the distinct ones).

The product of its (nonzero) digits is 3150, while the sum is 30.

The square root of 71915520 is about 8480.3018814191. The cubic root of 71915520 is about 415.8539921526.

The spelling of 71915520 in words is "seventy-one million, nine hundred fifteen thousand, five hundred twenty".