684421627 has 4 divisors (see below), whose sum is σ = 706499776. Its totient is φ = 662343480.

The previous prime is 684421613. The next prime is 684421643. The reversal of 684421627 is 726124486.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 684421627 - 2²³ = 676033019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 684421627.

It is not an unprimeable number, because it can be changed into a prime (684421687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11039028 + ... + 11039089.

It is an arithmetic number, because the mean of its divisors is an integer number (176624944).

Almost surely, 2^684421627 is an apocalyptic number.

684421627 is a deficient number, since it is larger than the sum of its proper divisors (22078149).

684421627 is a wasteful number, since it uses less digits than its factorization.

684421627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22078148.

The product of its digits is 129024, while the sum is 40.

The square root of 684421627 is about 26161.4530750874. The cubic root of 684421627 is about 881.2678123120.

The spelling of 684421627 in words is "six hundred eighty-four million, four hundred twenty-one thousand, six hundred twenty-seven".