214655640 has 64 divisors (see below), whose sum is σ = 652147200. Its totient is φ = 56514432.

The previous prime is 214655579. The next prime is 214655657. The reversal of 214655640 is 46556412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1842 + ... + 20801.

It is an arithmetic number, because the mean of its divisors is an integer number (10189800).

Almost surely, 2^214655640 is an apocalyptic number.

214655640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 214655640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (326073600).

214655640 is an abundant number, since it is smaller than the sum of its proper divisors (437491560).

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

214655640 is a wasteful number, since it uses less digits than its factorization.

214655640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22736 (or 22732 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 214655640 is about 14651.1310143620. The cubic root of 214655640 is about 598.7526308028.

The spelling of 214655640 in words is "two hundred fourteen million, six hundred fifty-five thousand, six hundred forty".