690387233 has 4 divisors (see below), whose sum is σ = 707225988. Its totient is φ = 673548480.

The previous prime is 690387227. The next prime is 690387239. The reversal of 690387233 is 332783096.

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

It is an interprime number because it is at equal distance from previous prime (690387227) and next prime (690387239).

It can be written as a sum of positive squares in 2 ways, for example, as 369869824 + 320517409 = 19232^2 + 17903^2 .

It is a cyclic number.

It is not a de Polignac number, because 690387233 - 2¹² = 690383137 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 16838713 = 690387233 / (6 + 9 + 0 + 3 + 8 + 7 + 2 + 3 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690387239) 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, 8419316 + ... + 8419397.

It is an arithmetic number, because the mean of its divisors is an integer number (176806497).

Almost surely, 2^690387233 is an apocalyptic number.

It is an amenable number.

690387233 is a deficient number, since it is larger than the sum of its proper divisors (16838755).

690387233 is a wasteful number, since it uses less digits than its factorization.

690387233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16838754.

The product of its (nonzero) digits is 163296, while the sum is 41.

The square root of 690387233 is about 26275.2208934578. The cubic root of 690387233 is about 883.8208659672.

The spelling of 690387233 in words is "six hundred ninety million, three hundred eighty-seven thousand, two hundred thirty-three".