780109755 has 16 divisors (see below), whose sum is σ = 1265275680. Its totient is φ = 410358528.

The previous prime is 780109727. The next prime is 780109763. The reversal of 780109755 is 557901087.

It is not a de Polignac number, because 780109755 - 2¹⁰ = 780108731 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 355120 + ... + 357309.

It is an arithmetic number, because the mean of its divisors is an integer number (79079730).

Almost surely, 2^780109755 is an apocalyptic number.

780109755 is a deficient number, since it is larger than the sum of its proper divisors (485165925).

780109755 is a wasteful number, since it uses less digits than its factorization.

780109755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712510.

The product of its (nonzero) digits is 88200, while the sum is 42.

The square root of 780109755 is about 27930.4449481207. Note that the first 3 decimals coincide. The cubic root of 780109755 is about 920.5595819866.

The spelling of 780109755 in words is "seven hundred eighty million, one hundred nine thousand, seven hundred fifty-five".