672209329 has 9 divisors (see below), whose sum is σ = 739188331. Its totient is φ = 610840120.

The previous prime is 672209297. The next prime is 672209333. The reversal of 672209329 is 923902276.

The square root of 672209329 is 25927.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 122213025 + 549996304 = 11055^2 + 23452^2 .

It is not a de Polignac number, because 672209329 - 2⁵ = 672209297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 672209291 and 672209300.

It is not an unprimeable number, because it can be changed into a prime (672209399) 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 8 ways as a sum of consecutive naturals, for example, 284019 + ... + 286375.

Almost surely, 2^672209329 is an apocalyptic number.

672209329 is the 25927-th square number.

672209329 is the 12964-th centered octagonal number.

It is an amenable number.

672209329 is a deficient number, since it is larger than the sum of its proper divisors (66979002).

672209329 is an frugal number, since it uses more digits than its factorization.

672209329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4736 (or 2368 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 40.

The cubic root of 672209329 is about 875.9947669843.

The spelling of 672209329 in words is "six hundred seventy-two million, two hundred nine thousand, three hundred twenty-nine".