672393809 has 8 divisors (see below), whose sum is σ = 729311688. Its totient is φ = 617405440.

The previous prime is 672393803. The next prime is 672393829. The reversal of 672393809 is 908393276.

It can be written as a sum of positive squares in 4 ways, for example, as 4326400 + 668067409 = 2080^2 + 25847^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 672393809 - 2¹² = 672389713 is a prime.

It is a super-2 number, since 2×672393809² = 904226868763056962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (672393803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 481652 + ... + 483045.

It is an arithmetic number, because the mean of its divisors is an integer number (91163961).

Almost surely, 2^672393809 is an apocalyptic number.

It is an amenable number.

672393809 is a deficient number, since it is larger than the sum of its proper divisors (56917879).

672393809 is a wasteful number, since it uses less digits than its factorization.

672393809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964755.

The product of its (nonzero) digits is 489888, while the sum is 47.

The square root of 672393809 is about 25930.5574371243. The cubic root of 672393809 is about 876.0748951659.

The spelling of 672393809 in words is "six hundred seventy-two million, three hundred ninety-three thousand, eight hundred nine".