217620490 has 16 divisors (see below), whose sum is σ = 412333920. Its totient is φ = 82466640.

The previous prime is 217620443. The next prime is 217620493. The reversal of 217620490 is 94026712.

It is not an unprimeable number, because it can be changed into a prime (217620493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 572496 + ... + 572875.

It is an arithmetic number, because the mean of its divisors is an integer number (25770870).

Almost surely, 2^217620490 is an apocalyptic number.

217620490 is a deficient number, since it is larger than the sum of its proper divisors (194713430).

217620490 is a wasteful number, since it uses less digits than its factorization.

217620490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145397.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 217620490 is about 14751.9656317387. The cubic root of 217620490 is about 601.4967169962.

The spelling of 217620490 in words is "two hundred seventeen million, six hundred twenty thousand, four hundred ninety".