80533440 has 280 divisors, whose sum is σ = 309798720. Its totient is φ = 19740672.

The previous prime is 80533433. The next prime is 80533441. The reversal of 80533440 is 4433508.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80533441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 336841 + ... + 337079.

It is an arithmetic number, because the mean of its divisors is an integer number (1106424).

Almost surely, 2^80533440 is an apocalyptic number.

80533440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80533440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154899360).

80533440 is an abundant number, since it is smaller than the sum of its proper divisors (229265280).

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

80533440 is a wasteful number, since it uses less digits than its factorization.

80533440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281 (or 262 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 80533440 is about 8974.0425673160. The cubic root of 80533440 is about 431.8425352034.

Adding to 80533440 its reverse (4433508), we get a palindrome (84966948).

The spelling of 80533440 in words is "eighty million, five hundred thirty-three thousand, four hundred forty".