216375690 has 16 divisors (see below), whose sum is σ = 519301728. Its totient is φ = 57700176.

The previous prime is 216375689. The next prime is 216375701. The reversal of 216375690 is 96573612.

It is a super-2 number, since 2×216375690² = 93636878445952200, 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, 3606232 + ... + 3606291.

It is an arithmetic number, because the mean of its divisors is an integer number (32456358).

Almost surely, 2^216375690 is an apocalyptic number.

216375690 is an abundant number, since it is smaller than the sum of its proper divisors (302926038).

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

216375690 is a wasteful number, since it uses less digits than its factorization.

216375690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7212533.

The product of its (nonzero) digits is 68040, while the sum is 39.

The square root of 216375690 is about 14709.7141372632. The cubic root of 216375690 is about 600.3476596268.

The spelling of 216375690 in words is "two hundred sixteen million, three hundred seventy-five thousand, six hundred ninety".