216863770 has 16 divisors (see below), whose sum is σ = 390548808. Its totient is φ = 86702400.

The previous prime is 216863767. The next prime is 216863783. The reversal of 216863770 is 77368612.

It can be written as a sum of positive squares in 4 ways, for example, as 182979729 + 33884041 = 13527^2 + 5821^2 .

It is a super-2 number, since 2×216863770² = 94059789477225800, which contains 22 as substring.

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, 22720 + ... + 30820.

Almost surely, 2^216863770 is an apocalyptic number.

216863770 is a deficient number, since it is larger than the sum of its proper divisors (173685038).

216863770 is a wasteful number, since it uses less digits than its factorization.

216863770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10785.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 216863770 is about 14726.2951892185. The cubic root of 216863770 is about 600.7987233004.

The spelling of 216863770 in words is "two hundred sixteen million, eight hundred sixty-three thousand, seven hundred seventy".