71990528 has 36 divisors (see below), whose sum is σ = 148670340. Its totient is φ = 34750464.

The previous prime is 71990507. The next prime is 71990533. The reversal of 71990528 is 82509917.

It can be written as a sum of positive squares in 2 ways, for example, as 21977344 + 50013184 = 4688^2 + 7072^2 .

It is a super-2 number, since 2×71990528² = 10365272243437568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2576 + ... + 12272.

Almost surely, 2^71990528 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 71990528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74335170).

71990528 is an abundant number, since it is smaller than the sum of its proper divisors (76679812).

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

71990528 is an equidigital number, since it uses as much as digits as its factorization.

71990528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9742 (or 9728 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 71990528 is about 8484.7232129280. The cubic root of 71990528 is about 415.9985207048.

The spelling of 71990528 in words is "seventy-one million, nine hundred ninety thousand, five hundred twenty-eight".