684509004 has 18 divisors (see below), whose sum is σ = 1730286740. Its totient is φ = 228169656.

The previous prime is 684508931. The next prime is 684509027. The reversal of 684509004 is 400905486.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 19014139 = 684509004 / (6 + 8 + 4 + 5 + 0 + 9 + 0 + 0 + 4).

It is a self number, because there is not a number n which added to its sum of digits gives 684509004.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9507034 + ... + 9507105.

Almost surely, 2^684509004 is an apocalyptic number.

It is an amenable number.

684509004 is an abundant number, since it is smaller than the sum of its proper divisors (1045777736).

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

684509004 is a wasteful number, since it uses less digits than its factorization.

684509004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19014149 (or 19014144 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 684509004 is about 26163.1229787271. The cubic root of 684509004 is about 881.3053132023.

The spelling of 684509004 in words is "six hundred eighty-four million, five hundred nine thousand, four".