216670956 has 12 divisors (see below), whose sum is σ = 505565592. Its totient is φ = 72223648.

The previous prime is 216670939. The next prime is 216670991. The reversal of 216670956 is 659076612.

216670956 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9027945 + ... + 9027968.

It is an arithmetic number, because the mean of its divisors is an integer number (42130466).

Almost surely, 2^216670956 is an apocalyptic number.

It is an amenable number.

216670956 is an abundant number, since it is smaller than the sum of its proper divisors (288894636).

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

216670956 is a wasteful number, since it uses less digits than its factorization.

216670956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18055920 (or 18055918 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 216670956 is about 14719.7471445674. The cubic root of 216670956 is about 600.6206133992.

The spelling of 216670956 in words is "two hundred sixteen million, six hundred seventy thousand, nine hundred fifty-six".