642018330 has 24 divisors (see below), whose sum is σ = 1669247892. Its totient is φ = 171204864.

The previous prime is 642018329. The next prime is 642018347. The reversal of 642018330 is 33810246.

It is a happy number.

642018330 is a `hidden beast` number, since 642 + 0 + 18 + 3 + 3 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 636098841 + 5919489 = 25221^2 + 2433^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 642018294 and 642018303.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3566679 + ... + 3566858.

Almost surely, 2^642018330 is an apocalyptic number.

642018330 is an abundant number, since it is smaller than the sum of its proper divisors (1027229562).

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

642018330 is a wasteful number, since it uses less digits than its factorization.

642018330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7133550 (or 7133547 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 642018330 is about 25338.0806297557. The cubic root of 642018330 is about 862.6788337429.

Adding to 642018330 its reverse (33810246), we get a palindrome (675828576).

The spelling of 642018330 in words is "six hundred forty-two million, eighteen thousand, three hundred thirty".