80542440 has 216 divisors, whose sum is σ = 294569730. Its totient is φ = 19071360.

The previous prime is 80542411. The next prime is 80542489. The reversal of 80542440 is 4424508.

80542440 is a `hidden beast` number, since 80 + 542 + 4 + 40 = 666.

It can be written as a sum of positive squares in only one way, i.e., 72488196 + 8054244 = 8514^2 + 2838^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 1873059 + ... + 1873101.

Almost surely, 2^80542440 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 80542440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147284865).

80542440 is an abundant number, since it is smaller than the sum of its proper divisors (214027290).

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

80542440 is a wasteful number, since it uses less digits than its factorization.

80542440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

The square root of 80542440 is about 8974.5439995579. The cubic root of 80542440 is about 431.8586214322.

Adding to 80542440 its reverse (4424508), we get a palindrome (84966948).

The spelling of 80542440 in words is "eighty million, five hundred forty-two thousand, four hundred forty".