216430780 has 24 divisors (see below), whose sum is σ = 457406208. Its totient is φ = 86019648.

The previous prime is 216430777. The next prime is 216430787. The reversal of 216430780 is 87034612.

216430780 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216430787) 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, 31324 + ... + 37603.

It is an arithmetic number, because the mean of its divisors is an integer number (19058592).

Almost surely, 2^216430780 is an apocalyptic number.

216430780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216430780 is an abundant number, since it is smaller than the sum of its proper divisors (240975428).

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

216430780 is a wasteful number, since it uses less digits than its factorization.

216430780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69093 (or 69091 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 216430780 is about 14711.5865901676. The cubic root of 216430780 is about 600.3986055012.

The spelling of 216430780 in words is "two hundred sixteen million, four hundred thirty thousand, seven hundred eighty".