684284977 has 4 divisors (see below), whose sum is σ = 684982080. Its totient is φ = 683587876.

The previous prime is 684284933. The next prime is 684284987. The reversal of 684284977 is 779482486.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 684284977 - 2¹⁵ = 684252209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684284927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347077 + ... + 349042.

It is an arithmetic number, because the mean of its divisors is an integer number (171245520).

Almost surely, 2^684284977 is an apocalyptic number.

It is an amenable number.

684284977 is a deficient number, since it is larger than the sum of its proper divisors (697103).

684284977 is an equidigital number, since it uses as much as digits as its factorization.

684284977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697102.

The product of its digits is 5419008, while the sum is 55.

The square root of 684284977 is about 26158.8412778548. The cubic root of 684284977 is about 881.2091577940.

It can be divided in two parts, 6842 and 84977, that added together give a palindrome (91819).

The spelling of 684284977 in words is "six hundred eighty-four million, two hundred eighty-four thousand, nine hundred seventy-seven".