684137755 has 12 divisors (see below), whose sum is σ = 955000800. Its totient is φ = 469122864.

The previous prime is 684137723. The next prime is 684137759. The reversal of 684137755 is 557731486.

684137755 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 684137755 - 2⁵ = 684137723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (684137759) 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, 1395955 + ... + 1396444.

It is an arithmetic number, because the mean of its divisors is an integer number (79583400).

Almost surely, 2^684137755 is an apocalyptic number.

684137755 is a deficient number, since it is larger than the sum of its proper divisors (270863045).

684137755 is a wasteful number, since it uses less digits than its factorization.

684137755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2792418 (or 2792411 counting only the distinct ones).

The product of its digits is 705600, while the sum is 46.

The square root of 684137755 is about 26156.0271256932. The cubic root of 684137755 is about 881.1459566989.

The spelling of 684137755 in words is "six hundred eighty-four million, one hundred thirty-seven thousand, seven hundred fifty-five".