216838870 has 16 divisors (see below), whose sum is σ = 400859568. Its totient is φ = 84391200.

The previous prime is 216838861. The next prime is 216838877. The reversal of 216838870 is 78838612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216838877) 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, 292656 + ... + 293395.

It is an arithmetic number, because the mean of its divisors is an integer number (25053723).

Almost surely, 2^216838870 is an apocalyptic number.

216838870 is a deficient number, since it is larger than the sum of its proper divisors (184020698).

216838870 is a wasteful number, since it uses less digits than its factorization.

216838870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586095.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 216838870 is about 14725.4497384630. The cubic root of 216838870 is about 600.7757281257.

The spelling of 216838870 in words is "two hundred sixteen million, eight hundred thirty-eight thousand, eight hundred seventy".