80561536 has 64 divisors (see below), whose sum is σ = 181213200. Its totient is φ = 35338240.

The previous prime is 80561531. The next prime is 80561629. The reversal of 80561536 is 63516508.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×80561536² = 12980322165358592, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80561531) 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, 39846 + ... + 41818.

Almost surely, 2^80561536 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 80561536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90606600).

80561536 is an abundant number, since it is smaller than the sum of its proper divisors (100651664).

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

80561536 is a wasteful number, since it uses less digits than its factorization.

80561536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2027 (or 2015 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 80561536 is about 8975.6078345703. The cubic root of 80561536 is about 431.8927488669.

The spelling of 80561536 in words is "eighty million, five hundred sixty-one thousand, five hundred thirty-six".