684572872 has 8 divisors (see below), whose sum is σ = 1283574150. Its totient is φ = 342286432.

The previous prime is 684572843. The next prime is 684572879. The reversal of 684572872 is 278275486.

It can be written as a sum of positive squares in only one way, i.e., 576288036 + 108284836 = 24006^2 + 10406^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (684572879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42785797 + ... + 42785812.

Almost surely, 2^684572872 is an apocalyptic number.

It is an amenable number.

684572872 is a deficient number, since it is larger than the sum of its proper divisors (599001278).

684572872 is a wasteful number, since it uses less digits than its factorization.

684572872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85571615 (or 85571611 counting only the distinct ones).

The product of its digits is 1505280, while the sum is 49.

The square root of 684572872 is about 26164.3435231997. The cubic root of 684572872 is about 881.3327223656.

The spelling of 684572872 in words is "six hundred eighty-four million, five hundred seventy-two thousand, eight hundred seventy-two".