684972678 has 32 divisors (see below), whose sum is σ = 1490551776. Its totient is φ = 208585728.

The previous prime is 684972661. The next prime is 684972697. The reversal of 684972678 is 876279486.

684972678 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37701 + ... + 52832.

It is an arithmetic number, because the mean of its divisors is an integer number (46579743).

Almost surely, 2^684972678 is an apocalyptic number.

684972678 is an abundant number, since it is smaller than the sum of its proper divisors (805579098).

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

684972678 is a wasteful number, since it uses less digits than its factorization.

684972678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90648.

The product of its digits is 8128512, while the sum is 57.

The square root of 684972678 is about 26171.9826914202. The cubic root of 684972678 is about 881.5042617060.

The spelling of 684972678 in words is "six hundred eighty-four million, nine hundred seventy-two thousand, six hundred seventy-eight".