672776509 has 4 divisors (see below), whose sum is σ = 673661340. Its totient is φ = 671891680.

The previous prime is 672776501. The next prime is 672776521. The reversal of 672776509 is 905677276.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 307125625 + 365650884 = 17525^2 + 19122^2 .

It is a cyclic number.

It is not a de Polignac number, because 672776509 - 2³ = 672776501 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672776501) 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 3 ways as a sum of consecutive naturals, for example, 441274 + ... + 442795.

It is an arithmetic number, because the mean of its divisors is an integer number (168415335).

Almost surely, 2^672776509 is an apocalyptic number.

It is an amenable number.

672776509 is a deficient number, since it is larger than the sum of its proper divisors (884831).

672776509 is an equidigital number, since it uses as much as digits as its factorization.

672776509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884830.

The product of its (nonzero) digits is 1111320, while the sum is 49.

The square root of 672776509 is about 25937.9357120030. The cubic root of 672776509 is about 876.2410727192.

The spelling of 672776509 in words is "six hundred seventy-two million, seven hundred seventy-six thousand, five hundred nine".