690822785 has 4 divisors (see below), whose sum is σ = 828987348. Its totient is φ = 552658224.

The previous prime is 690822773. The next prime is 690822787. The reversal of 690822785 is 587228096.

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 95023504 + 595799281 = 9748^2 + 24409^2 .

It is a cyclic number.

It is not a de Polignac number, because 690822785 - 2¹⁴ = 690806401 is a prime.

It is a super-2 number, since 2×690822785² = 954472240550312450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (690822787) 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, 69082274 + ... + 69082283.

It is an arithmetic number, because the mean of its divisors is an integer number (207246837).

Almost surely, 2^690822785 is an apocalyptic number.

It is an amenable number.

690822785 is a deficient number, since it is larger than the sum of its proper divisors (138164563).

690822785 is a wasteful number, since it uses less digits than its factorization.

690822785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138164562.

The product of its (nonzero) digits is 483840, while the sum is 47.

The square root of 690822785 is about 26283.5078518831. The cubic root of 690822785 is about 884.0066887457.

The spelling of 690822785 in words is "six hundred ninety million, eight hundred twenty-two thousand, seven hundred eighty-five".