80569780 has 24 divisors (see below), whose sum is σ = 170081352. Its totient is φ = 32059392.

The previous prime is 80569777. The next prime is 80569789. The reversal of 80569780 is 8796508.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 753424 + 79816356 = 868^2 + 8934^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80569789) 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, 6577 + ... + 14296.

It is an arithmetic number, because the mean of its divisors is an integer number (7086723).

Almost surely, 2^80569780 is an apocalyptic number.

It is an amenable number.

80569780 is an abundant number, since it is smaller than the sum of its proper divisors (89511572).

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

80569780 is a wasteful number, since it uses less digits than its factorization.

80569780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21075 (or 21073 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 80569780 is about 8976.0670674856. The cubic root of 80569780 is about 431.9074804727.

The spelling of 80569780 in words is "eighty million, five hundred sixty-nine thousand, seven hundred eighty".