218328464 has 10 divisors (see below), whose sum is σ = 423011430. Its totient is φ = 109164224.

The previous prime is 218328457. The next prime is 218328511. The reversal of 218328464 is 464823812.

It can be written as a sum of positive squares in only one way, i.e., 190660864 + 27667600 = 13808^2 + 5260^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6822749 + ... + 6822780.

It is an arithmetic number, because the mean of its divisors is an integer number (42301143).

Almost surely, 2^218328464 is an apocalyptic number.

It is an amenable number.

218328464 is a deficient number, since it is larger than the sum of its proper divisors (204682966).

218328464 is a wasteful number, since it uses less digits than its factorization.

218328464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13645537 (or 13645531 counting only the distinct ones).

The product of its digits is 73728, while the sum is 38.

The square root of 218328464 is about 14775.9420681052. The cubic root of 218328464 is about 602.1482841305.

The spelling of 218328464 in words is "two hundred eighteen million, three hundred twenty-eight thousand, four hundred sixty-four".