80765840 has 20 divisors (see below), whose sum is σ = 187780764. Its totient is φ = 32306304.

The previous prime is 80765833. The next prime is 80765843. The reversal of 80765840 is 4856708.

It can be written as a sum of positive squares in 2 ways, for example, as 41628304 + 39137536 = 6452^2 + 6256^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 80765794 and 80765803.

It is not an unprimeable number, because it can be changed into a prime (80765843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 504707 + ... + 504866.

Almost surely, 2^80765840 is an apocalyptic number.

80765840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

80765840 is an abundant number, since it is smaller than the sum of its proper divisors (107014924).

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

80765840 is a wasteful number, since it uses less digits than its factorization.

80765840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009586 (or 1009580 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 80765840 is about 8986.9816957642. The cubic root of 80765840 is about 432.2575339138.

The spelling of 80765840 in words is "eighty million, seven hundred sixty-five thousand, eight hundred forty".