684928922 has 4 divisors (see below), whose sum is σ = 1027393386. Its totient is φ = 342464460.

The previous prime is 684928921. The next prime is 684928927. The reversal of 684928922 is 229829486.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 664144441 + 20784481 = 25771^2 + 4559^2 .

It is not an unprimeable number, because it can be changed into a prime (684928921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171232229 + ... + 171232232.

Almost surely, 2^684928922 is an apocalyptic number.

684928922 is a deficient number, since it is larger than the sum of its proper divisors (342464464).

684928922 is a wasteful number, since it uses less digits than its factorization.

684928922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342464463.

The product of its digits is 995328, while the sum is 50.

The square root of 684928922 is about 26171.1467459873. The cubic root of 684928922 is about 881.4854911657.

The spelling of 684928922 in words is "six hundred eighty-four million, nine hundred twenty-eight thousand, nine hundred twenty-two".