684360978 has 32 divisors (see below), whose sum is σ = 1566711936. Its totient is φ = 195224448.

The previous prime is 684360973. The next prime is 684360983. The reversal of 684360978 is 879063486.

It is an interprime number because it is at equal distance from previous prime (684360973) and next prime (684360983).

It is a self number, because there is not a number n which added to its sum of digits gives 684360978.

It is not an unprimeable number, because it can be changed into a prime (684360973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14950 + ... + 39902.

It is an arithmetic number, because the mean of its divisors is an integer number (48959748).

Almost surely, 2^684360978 is an apocalyptic number.

684360978 is an abundant number, since it is smaller than the sum of its proper divisors (882350958).

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

684360978 is a wasteful number, since it uses less digits than its factorization.

684360978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25618.

The product of its (nonzero) digits is 1741824, while the sum is 51.

The square root of 684360978 is about 26160.2939203672. The cubic root of 684360978 is about 881.2417807996.

The spelling of 684360978 in words is "six hundred eighty-four million, three hundred sixty thousand, nine hundred seventy-eight".