780680155 has 8 divisors (see below), whose sum is σ = 948103632. Its totient is φ = 617019168.

The previous prime is 780680149. The next prime is 780680209. The reversal of 780680155 is 551086087.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 780680155 - 2⁵ = 780680123 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 940164 + ... + 940993.

It is an arithmetic number, because the mean of its divisors is an integer number (118512954).

Almost surely, 2^780680155 is an apocalyptic number.

780680155 is a deficient number, since it is larger than the sum of its proper divisors (167423477).

780680155 is a wasteful number, since it uses less digits than its factorization.

780680155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1881245.

The product of its (nonzero) digits is 67200, while the sum is 40.

The square root of 780680155 is about 27940.6541619913. The cubic root of 780680155 is about 920.7838919877.

The spelling of 780680155 in words is "seven hundred eighty million, six hundred eighty thousand, one hundred fifty-five".