216946578 has 16 divisors (see below), whose sum is σ = 438769440. Its totient is φ = 71502816.

The previous prime is 216946573. The next prime is 216946589. The reversal of 216946578 is 875649612.

It is not an unprimeable number, because it can be changed into a prime (216946573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202600 + ... + 203667.

It is an arithmetic number, because the mean of its divisors is an integer number (27423090).

Almost surely, 2^216946578 is an apocalyptic number.

216946578 is an abundant number, since it is smaller than the sum of its proper divisors (221822862).

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

216946578 is a wasteful number, since it uses less digits than its factorization.

216946578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406361.

The product of its digits is 725760, while the sum is 48.

The square root of 216946578 is about 14729.1064902118. The cubic root of 216946578 is about 600.8751839123.

The spelling of 216946578 in words is "two hundred sixteen million, nine hundred forty-six thousand, five hundred seventy-eight".