690347761 has 4 divisors (see below), whose sum is σ = 690493300. Its totient is φ = 690202224.

The previous prime is 690347759. The next prime is 690347771. The reversal of 690347761 is 167743096.

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 688747536 + 1600225 = 26244^2 + 1265^2 .

It is a cyclic number.

It is not a de Polignac number, because 690347761 - 2¹ = 690347759 is a prime.

It is a super-2 number, since 2×690347761² = 953160062235426242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690347771) 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, 65406 + ... + 75223.

It is an arithmetic number, because the mean of its divisors is an integer number (172623325).

Almost surely, 2^690347761 is an apocalyptic number.

It is an amenable number.

690347761 is a deficient number, since it is larger than the sum of its proper divisors (145539).

690347761 is a wasteful number, since it uses less digits than its factorization.

690347761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145538.

The product of its (nonzero) digits is 190512, while the sum is 43.

The square root of 690347761 is about 26274.4697567810. The cubic root of 690347761 is about 883.8040218733.

The spelling of 690347761 in words is "six hundred ninety million, three hundred forty-seven thousand, seven hundred sixty-one".