80820544 has 56 divisors (see below), whose sum is σ = 185440320. Its totient is φ = 34231296.

The previous prime is 80820541. The next prime is 80820611. The reversal of 80820544 is 44502808.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80820541) 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, 38859 + ... + 40885.

Almost surely, 2^80820544 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 80820544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92720160).

80820544 is an abundant number, since it is smaller than the sum of its proper divisors (104619776).

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

80820544 is a wasteful number, since it uses less digits than its factorization.

80820544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2135 (or 2125 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 31.

The square root of 80820544 is about 8990.0246940706. The cubic root of 80820544 is about 432.3551035443.

The spelling of 80820544 in words is "eighty million, eight hundred twenty thousand, five hundred forty-four".