690347641 has 4 divisors (see below), whose sum is σ = 699804532. Its totient is φ = 680890752.

The previous prime is 690347621. The next prime is 690347657. The reversal of 690347641 is 146743096.

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 282105616 + 408242025 = 16796^2 + 20205^2 .

It is a cyclic number.

It is not a de Polignac number, because 690347641 - 2⁷ = 690347513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 690347594 and 690347603.

It is not an unprimeable number, because it can be changed into a prime (690347621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4728336 + ... + 4728481.

It is an arithmetic number, because the mean of its divisors is an integer number (174951133).

Almost surely, 2^690347641 is an apocalyptic number.

It is an amenable number.

690347641 is a deficient number, since it is larger than the sum of its proper divisors (9456891).

690347641 is an equidigital number, since it uses as much as digits as its factorization.

690347641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9456890.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 690347641 is about 26274.4674731953. The cubic root of 690347641 is about 883.8039706641.

The spelling of 690347641 in words is "six hundred ninety million, three hundred forty-seven thousand, six hundred forty-one".