216878736 has 20 divisors (see below), whose sum is σ = 560270192. Its totient is φ = 72292896.

The previous prime is 216878687. The next prime is 216878737. The reversal of 216878736 is 637878612.

216878736 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×216878736² = 94072772257915392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 4518307 = 216878736 / (2 + 1 + 6 + 8 + 7 + 8 + 7 + 3 + 6).

It is not an unprimeable number, because it can be changed into a prime (216878737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2259106 + ... + 2259201.

Almost surely, 2^216878736 is an apocalyptic number.

It is an amenable number.

216878736 is an abundant number, since it is smaller than the sum of its proper divisors (343391456).

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

216878736 is a wasteful number, since it uses less digits than its factorization.

216878736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4518318 (or 4518312 counting only the distinct ones).

The product of its digits is 677376, while the sum is 48.

The square root of 216878736 is about 14726.8033191185. The cubic root of 216878736 is about 600.8125435693.

The spelling of 216878736 in words is "two hundred sixteen million, eight hundred seventy-eight thousand, seven hundred thirty-six".