216641730 has 16 divisors (see below), whose sum is σ = 519940224. Its totient is φ = 57771120.

The previous prime is 216641729. The next prime is 216641759. The reversal of 216641730 is 37146612.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 7221391 = 216641730 / (2 + 1 + 6 + 6 + 4 + 1 + 7 + 3 + 0).

It is an unprimeable number.

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, 3610666 + ... + 3610725.

It is an arithmetic number, because the mean of its divisors is an integer number (32496264).

Almost surely, 2^216641730 is an apocalyptic number.

216641730 is an abundant number, since it is smaller than the sum of its proper divisors (303298494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216641730 is a wasteful number, since it uses less digits than its factorization.

216641730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7221401.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 216641730 is about 14718.7543630567. The cubic root of 216641730 is about 600.5936069687.

The spelling of 216641730 in words is "two hundred sixteen million, six hundred forty-one thousand, seven hundred thirty".