80775540 has 144 divisors (see below), whose sum is σ = 259459200. Its totient is φ = 20300544.

The previous prime is 80775533. The next prime is 80775559. The reversal of 80775540 is 4557708.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 80775495 and 80775504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 451171 + ... + 451349.

It is an arithmetic number, because the mean of its divisors is an integer number (1801800).

Almost surely, 2^80775540 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 80775540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129729600).

80775540 is an abundant number, since it is smaller than the sum of its proper divisors (178683660).

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

80775540 is a wasteful number, since it uses less digits than its factorization.

80775540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326 (or 321 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 36.

The square root of 80775540 is about 8987.5213490706. The cubic root of 80775540 is about 432.2748379714.

The spelling of 80775540 in words is "eighty million, seven hundred seventy-five thousand, five hundred forty".