684679494 has 16 divisors (see below), whose sum is σ = 1391808240. Its totient is φ = 224484960.

The previous prime is 684679469. The next prime is 684679507. The reversal of 684679494 is 494976486.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 934989 + ... + 935720.

It is an arithmetic number, because the mean of its divisors is an integer number (86988015).

Almost surely, 2^684679494 is an apocalyptic number.

684679494 is an abundant number, since it is smaller than the sum of its proper divisors (707128746).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

684679494 is a wasteful number, since it uses less digits than its factorization.

684679494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870775.

The product of its digits is 10450944, while the sum is 57.

The square root of 684679494 is about 26166.3809878248. The cubic root of 684679494 is about 881.3784757510.

The spelling of 684679494 in words is "six hundred eighty-four million, six hundred seventy-nine thousand, four hundred ninety-four".