684699478 has 16 divisors (see below), whose sum is σ = 1062190080. Its totient is φ = 330820776.

The previous prime is 684699473. The next prime is 684699481. The reversal of 684699478 is 874996486.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684699473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38676 + ... + 53527.

It is an arithmetic number, because the mean of its divisors is an integer number (66386880).

Almost surely, 2^684699478 is an apocalyptic number.

684699478 is a deficient number, since it is larger than the sum of its proper divisors (377490602).

684699478 is a wasteful number, since it uses less digits than its factorization.

684699478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92331.

The product of its digits is 20901888, while the sum is 61.

The square root of 684699478 is about 26166.7628490801. The cubic root of 684699478 is about 881.3870507102.

The spelling of 684699478 in words is "six hundred eighty-four million, six hundred ninety-nine thousand, four hundred seventy-eight".