420730642 has 32 divisors (see below), whose sum is σ = 680011200. Its totient is φ = 194620608.

The previous prime is 420730633. The next prime is 420730649. The reversal of 420730642 is 246037024.

It is a self number, because there is not a number n which added to its sum of digits gives 420730642.

It is not an unprimeable number, because it can be changed into a prime (420730649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 638109 + ... + 638767.

It is an arithmetic number, because the mean of its divisors is an integer number (21250350).

Almost surely, 2^420730642 is an apocalyptic number.

420730642 is a deficient number, since it is larger than the sum of its proper divisors (259280558).

420730642 is a wasteful number, since it uses less digits than its factorization.

420730642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050.

The product of its (nonzero) digits is 8064, while the sum is 28.

The square root of 420730642 is about 20511.7196256189. The cubic root of 420730642 is about 749.3212478386.

Adding to 420730642 its reverse (246037024), we get a palindrome (666767666).

The spelling of 420730642 in words is "four hundred twenty million, seven hundred thirty thousand, six hundred forty-two".