684897727 has 4 divisors (see below), whose sum is σ = 708514920. Its totient is φ = 661280536.

The previous prime is 684897701. The next prime is 684897739. The reversal of 684897727 is 727798486.

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 684897727 - 2¹⁵ = 684864959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684897757) 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, 11808553 + ... + 11808610.

It is an arithmetic number, because the mean of its divisors is an integer number (177128730).

Almost surely, 2^684897727 is an apocalyptic number.

684897727 is a deficient number, since it is larger than the sum of its proper divisors (23617193).

684897727 is a wasteful number, since it uses less digits than its factorization.

684897727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23617192.

The product of its digits is 9483264, while the sum is 58.

The square root of 684897727 is about 26170.5507584384. The cubic root of 684897727 is about 881.4721085813.

The spelling of 684897727 in words is "six hundred eighty-four million, eight hundred ninety-seven thousand, seven hundred twenty-seven".