776728080 has 60 divisors (see below), whose sum is σ = 2608514220. Its totient is φ = 207127296.

The previous prime is 776728061. The next prime is 776728081. The reversal of 776728080 is 80827677.

776728080 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 364962816 + 411765264 = 19104^2 + 20292^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (776728081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 538675 + ... + 540114.

It is an arithmetic number, because the mean of its divisors is an integer number (43475237).

Almost surely, 2^776728080 is an apocalyptic number.

It is an amenable number.

776728080 is an abundant number, since it is smaller than the sum of its proper divisors (1831786140).

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

776728080 is a wasteful number, since it uses less digits than its factorization.

776728080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078808 (or 1078799 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 45.

The square root of 776728080 is about 27869.8417648899. The cubic root of 776728080 is about 919.2274863562.

The spelling of 776728080 in words is "seven hundred seventy-six million, seven hundred twenty-eight thousand, eighty".