216723970 has 16 divisors (see below), whose sum is σ = 392261688. Its totient is φ = 86209920.

The previous prime is 216723961. The next prime is 216724019. The reversal of 216723970 is 79327612.

It can be written as a sum of positive squares in 4 ways, for example, as 98545329 + 118178641 = 9927^2 + 10871^2 .

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, 58059 + ... + 61678.

Almost surely, 2^216723970 is an apocalyptic number.

216723970 is a deficient number, since it is larger than the sum of its proper divisors (175537718).

216723970 is a wasteful number, since it uses less digits than its factorization.

216723970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119925.

The product of its (nonzero) digits is 31752, while the sum is 37.

The square root of 216723970 is about 14721.5478126452. The cubic root of 216723970 is about 600.6695950521.

The spelling of 216723970 in words is "two hundred sixteen million, seven hundred twenty-three thousand, nine hundred seventy".