690213649 has 4 divisors (see below), whose sum is σ = 699935040. Its totient is φ = 680492260.

The previous prime is 690213619. The next prime is 690213673. The reversal of 690213649 is 946312096.

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 690213649 - 2⁷ = 690213521 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 not an unprimeable number, because it can be changed into a prime (690213619) 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, 4860589 + ... + 4860730.

It is an arithmetic number, because the mean of its divisors is an integer number (174983760).

Almost surely, 2^690213649 is an apocalyptic number.

It is an amenable number.

690213649 is a deficient number, since it is larger than the sum of its proper divisors (9721391).

690213649 is an equidigital number, since it uses as much as digits as its factorization.

690213649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9721390.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 690213649 is about 26271.9174975867. The cubic root of 690213649 is about 883.7467867579.

The spelling of 690213649 in words is "six hundred ninety million, two hundred thirteen thousand, six hundred forty-nine".