420642660 has 48 divisors (see below), whose sum is σ = 1178767296. Its totient is φ = 112079232.

The previous prime is 420642659. The next prime is 420642671. The reversal of 420642660 is 66246024.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102814 + ... + 106826.

It is an arithmetic number, because the mean of its divisors is an integer number (24557652).

Almost surely, 2^420642660 is an apocalyptic number.

It is an amenable number.

420642660 is an abundant number, since it is smaller than the sum of its proper divisors (758124636).

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

420642660 is a wasteful number, since it uses less digits than its factorization.

420642660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5772 (or 5770 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 420642660 is about 20509.5748371340. The cubic root of 420642660 is about 749.2690122184.

Adding to 420642660 its reverse (66246024), we get a palindrome (486888684).

The spelling of 420642660 in words is "four hundred twenty million, six hundred forty-two thousand, six hundred sixty".