684879478 has 8 divisors (see below), whose sum is σ = 1027621872. Its totient is φ = 342338856.

The previous prime is 684879473. The next prime is 684879479. The reversal of 684879478 is 874978486.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684879473) 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, 41650 + ... + 55717.

It is an arithmetic number, because the mean of its divisors is an integer number (128452734).

Almost surely, 2^684879478 is an apocalyptic number.

684879478 is a deficient number, since it is larger than the sum of its proper divisors (342742394).

684879478 is a wasteful number, since it uses less digits than its factorization.

684879478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100886.

The product of its digits is 21676032, while the sum is 61.

The square root of 684879478 is about 26170.2021008627. The cubic root of 684879478 is about 881.4642796132.

The spelling of 684879478 in words is "six hundred eighty-four million, eight hundred seventy-nine thousand, four hundred seventy-eight".