690218885 has 4 divisors (see below), whose sum is σ = 828262668. Its totient is φ = 552175104.

The previous prime is 690218873. The next prime is 690218897. The reversal of 690218885 is 588812096.

690218885 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 (690218873) and next prime (690218897).

It can be written as a sum of positive squares in 2 ways, for example, as 379119841 + 311099044 = 19471^2 + 17638^2 .

It is a cyclic number.

It is not a de Polignac number, because 690218885 - 2¹⁴ = 690202501 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69021884 + ... + 69021893.

It is an arithmetic number, because the mean of its divisors is an integer number (207065667).

Almost surely, 2^690218885 is an apocalyptic number.

It is an amenable number.

690218885 is a deficient number, since it is larger than the sum of its proper divisors (138043783).

690218885 is a wasteful number, since it uses less digits than its factorization.

690218885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138043782.

The product of its (nonzero) digits is 276480, while the sum is 47.

The square root of 690218885 is about 26272.0171475279. The cubic root of 690218885 is about 883.7490214701.

The spelling of 690218885 in words is "six hundred ninety million, two hundred eighteen thousand, eight hundred eighty-five".