4218706728 has 24 divisors (see below), whose sum is σ = 11425664250. Its totient is φ = 1406235552.

The previous prime is 4218706721. The next prime is 4218706741. The reversal of 4218706728 is 8276078124.

It can be written as a sum of positive squares in only one way, i.e., 3292234884 + 926471844 = 57378^2 + 30438^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (4218706721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29296503 + ... + 29296646.

Almost surely, 2^4218706728 is an apocalyptic number.

It is an amenable number.

4218706728 is an abundant number, since it is smaller than the sum of its proper divisors (7206957522).

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

4218706728 is a wasteful number, since it uses less digits than its factorization.

4218706728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58593161 (or 58593154 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 45.

The square root of 4218706728 is about 64951.5721749674. The cubic root of 4218706728 is about 1615.8204929600.

The spelling of 4218706728 in words is "four billion, two hundred eighteen million, seven hundred six thousand, seven hundred twenty-eight".