684729477 has 16 divisors (see below), whose sum is σ = 1024266880. Its totient is φ = 452052576.

The previous prime is 684729433. The next prime is 684729509. The reversal of 684729477 is 774927486.

It is not a de Polignac number, because 684729477 - 2²² = 680535173 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 (684729427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120328 + ... + 125889.

It is an arithmetic number, because the mean of its divisors is an integer number (64016680).

Almost surely, 2^684729477 is an apocalyptic number.

It is an amenable number.

684729477 is a deficient number, since it is larger than the sum of its proper divisors (339537403).

684729477 is a wasteful number, since it uses less digits than its factorization.

684729477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246329 (or 246323 counting only the distinct ones).

The product of its digits is 4741632, while the sum is 54.

The square root of 684729477 is about 26167.3360699938. The cubic root of 684729477 is about 881.3999227048.

The spelling of 684729477 in words is "six hundred eighty-four million, seven hundred twenty-nine thousand, four hundred seventy-seven".