71521024 has 36 divisors (see below), whose sum is σ = 143304840. Its totient is φ = 35624960.

The previous prime is 71521013. The next prime is 71521027. The reversal of 71521024 is 42012517.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 71520986 and 71521004.

It is not an unprimeable number, because it can be changed into a prime (71521027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125412 + ... + 125980.

It is an arithmetic number, because the mean of its divisors is an integer number (3980690).

Almost surely, 2^71521024 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 71521024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71652420).

71521024 is an abundant number, since it is smaller than the sum of its proper divisors (71783816).

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

71521024 is an equidigital number, since it uses as much as digits as its factorization.

71521024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076 (or 1062 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 71521024 is about 8457.0103464522. The cubic root of 71521024 is about 415.0922018972.

The spelling of 71521024 in words is "seventy-one million, five hundred twenty-one thousand, twenty-four".