216506670 has 16 divisors (see below), whose sum is σ = 519616080. Its totient is φ = 57735104.

The previous prime is 216506639. The next prime is 216506699. The reversal of 216506670 is 76605612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3608415 + ... + 3608474.

It is an arithmetic number, because the mean of its divisors is an integer number (32476005).

Almost surely, 2^216506670 is an apocalyptic number.

216506670 is an abundant number, since it is smaller than the sum of its proper divisors (303109410).

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

216506670 is a wasteful number, since it uses less digits than its factorization.

216506670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7216899.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 216506670 is about 14714.1656236431. The cubic root of 216506670 is about 600.4687725473.

The spelling of 216506670 in words is "two hundred sixteen million, five hundred six thousand, six hundred seventy".