690821219 has 8 divisors (see below), whose sum is σ = 757005312. Its totient is φ = 625200840.

The previous prime is 690821213. The next prime is 690821227. The reversal of 690821219 is 912128096.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 690821219 - 2⁴ = 690821203 is a prime.

It is a super-2 number, since 2×690821219² = 954467913241291922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690821213) 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 7 ways as a sum of consecutive naturals, for example, 138359 + ... + 143264.

It is an arithmetic number, because the mean of its divisors is an integer number (94625664).

Almost surely, 2^690821219 is an apocalyptic number.

690821219 is a deficient number, since it is larger than the sum of its proper divisors (66184093).

690821219 is a wasteful number, since it uses less digits than its factorization.

690821219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281857.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 690821219 is about 26283.4780613221. The cubic root of 690821219 is about 884.0060207714.

The spelling of 690821219 in words is "six hundred ninety million, eight hundred twenty-one thousand, two hundred nineteen".