218055380 has 48 divisors (see below), whose sum is σ = 466908624. Its totient is φ = 85524480.

The previous prime is 218055377. The next prime is 218055491. The reversal of 218055380 is 83550812.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 315844 + 217739536 = 562^2 + 14756^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 339860 + ... + 340500.

It is an arithmetic number, because the mean of its divisors is an integer number (9727263).

Almost surely, 2^218055380 is an apocalyptic number.

218055380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218055380 is an abundant number, since it is smaller than the sum of its proper divisors (248853244).

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

218055380 is a wasteful number, since it uses less digits than its factorization.

218055380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956 (or 954 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 218055380 is about 14766.6983445860. The cubic root of 218055380 is about 601.8971248364.

The spelling of 218055380 in words is "two hundred eighteen million, fifty-five thousand, three hundred eighty".