690660673 has 4 divisors (see below), whose sum is σ = 690787888. Its totient is φ = 690533460.

The previous prime is 690660653. The next prime is 690660757. The reversal of 690660673 is 376066096.

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 not a de Polignac number, because 690660673 - 2⁹ = 690660161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690660643) 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, 55083 + ... + 66448.

It is an arithmetic number, because the mean of its divisors is an integer number (172696972).

Almost surely, 2^690660673 is an apocalyptic number.

It is an amenable number.

690660673 is a deficient number, since it is larger than the sum of its proper divisors (127215).

690660673 is a wasteful number, since it uses less digits than its factorization.

690660673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127214.

The product of its (nonzero) digits is 244944, while the sum is 43.

The square root of 690660673 is about 26280.4237599016. The cubic root of 690660673 is about 883.9375348292.

The spelling of 690660673 in words is "six hundred ninety million, six hundred sixty thousand, six hundred seventy-three".