671540773 has 4 divisors (see below), whose sum is σ = 682922880. Its totient is φ = 660158668.

The previous prime is 671540767. The next prime is 671540777. The reversal of 671540773 is 377045176.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671540773 is a prime.

It is a Smith number, since the sum of its digits (40) 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 (671540777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5690965 + ... + 5691082.

It is an arithmetic number, because the mean of its divisors is an integer number (170730720).

Almost surely, 2^671540773 is an apocalyptic number.

It is an amenable number.

671540773 is a deficient number, since it is larger than the sum of its proper divisors (11382107).

671540773 is a wasteful number, since it uses less digits than its factorization.

671540773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11382106.

The product of its (nonzero) digits is 123480, while the sum is 40.

The square root of 671540773 is about 25914.1037468017. The cubic root of 671540773 is about 875.7042593524.

The spelling of 671540773 in words is "six hundred seventy-one million, five hundred forty thousand, seven hundred seventy-three".