672404920009 has 9 divisors (see below), whose sum is σ = 674480160679. Its totient is φ = 670336052440.

The previous prime is 672404919997. The next prime is 672404920049. The reversal of 672404920009 is 900029404276.

The square root of 672404920009 is 820003.

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., 641365527609 + 31039392400 = 800853^2 + 176180^2 .

It is not a de Polignac number, because 672404920009 - 2²¹ = 672402822857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (672404920049) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 314060079 + ... + 314062219.

Almost surely, 2^672404920009 is an apocalyptic number.

672404920009 is the 820003-rd square number.

672404920009 is the 410002-nd centered octagonal number.

It is an amenable number.

672404920009 is a deficient number, since it is larger than the sum of its proper divisors (2075240670).

672404920009 is an frugal number, since it uses more digits than its factorization.

672404920009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5048 (or 2524 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 43.

The spelling of 672404920009 in words is "six hundred seventy-two billion, four hundred four million, nine hundred twenty thousand, nine".