890221655 has 8 divisors (see below), whose sum is σ = 1088422272. Its totient is φ = 698739808.

The previous prime is 890221603. The next prime is 890221663. The reversal of 890221655 is 556122098.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-890221655 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1679399 + ... + 1679928.

It is an arithmetic number, because the mean of its divisors is an integer number (136052784).

Almost surely, 2^890221655 is an apocalyptic number.

890221655 is a deficient number, since it is larger than the sum of its proper divisors (198200617).

890221655 is a wasteful number, since it uses less digits than its factorization.

890221655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3359385.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 890221655 is about 29836.5824953194. The cubic root of 890221655 is about 961.9800189054.

The spelling of 890221655 in words is "eight hundred ninety million, two hundred twenty-one thousand, six hundred fifty-five".