218133650 has 48 divisors (see below), whose sum is σ = 479701440. Its totient is φ = 72206400.

The previous prime is 218133599. The next prime is 218133659. The reversal of 218133650 is 56331812.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (218133659) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 596 + ... + 20895.

It is an arithmetic number, because the mean of its divisors is an integer number (9993780).

Almost surely, 2^218133650 is an apocalyptic number.

218133650 is an abundant number, since it is smaller than the sum of its proper divisors (261567790).

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

218133650 is a wasteful number, since it uses less digits than its factorization.

218133650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21539 (or 21534 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 218133650 is about 14769.3483268559. The cubic root of 218133650 is about 601.9691323120.

The spelling of 218133650 in words is "two hundred eighteen million, one hundred thirty-three thousand, six hundred fifty".