216814540 has 12 divisors (see below), whose sum is σ = 455310576. Its totient is φ = 86725808.

The previous prime is 216814513. The next prime is 216814541. The reversal of 216814540 is 45418612.

It is not an unprimeable number, because it can be changed into a prime (216814541) 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, 5420344 + ... + 5420383.

It is an arithmetic number, because the mean of its divisors is an integer number (37942548).

Almost surely, 2^216814540 is an apocalyptic number.

216814540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216814540 is an abundant number, since it is smaller than the sum of its proper divisors (238496036).

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

216814540 is a wasteful number, since it uses less digits than its factorization.

216814540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10840736 (or 10840734 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 216814540 is about 14724.6235945100. The cubic root of 216814540 is about 600.7532576462.

The spelling of 216814540 in words is "two hundred sixteen million, eight hundred fourteen thousand, five hundred forty".