672761305 has 8 divisors (see below), whose sum is σ = 807453000. Its totient is φ = 538116096.

The previous prime is 672761263. The next prime is 672761321. The reversal of 672761305 is 503167276.

It can be written as a sum of positive squares in 4 ways, for example, as 29073664 + 643687641 = 5392^2 + 25371^2 .

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 672761305 - 2¹³ = 672753113 is a prime.

It is an unprimeable number.

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, 48601 + ... + 60889.

It is an arithmetic number, because the mean of its divisors is an integer number (100931625).

Almost surely, 2^672761305 is an apocalyptic number.

It is an amenable number.

672761305 is a deficient number, since it is larger than the sum of its proper divisors (134691695).

672761305 is a wasteful number, since it uses less digits than its factorization.

672761305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23243.

The product of its (nonzero) digits is 52920, while the sum is 37.

The square root of 672761305 is about 25937.6426261139. The cubic root of 672761305 is about 876.2344719787.

The spelling of 672761305 in words is "six hundred seventy-two million, seven hundred sixty-one thousand, three hundred five".