421712660 has 24 divisors (see below), whose sum is σ = 889473480. Its totient is φ = 167946624.

The previous prime is 421712647. The next prime is 421712677. The reversal of 421712660 is 66217124.

It can be written as a sum of positive squares in 4 ways, for example, as 169728784 + 251983876 = 13028^2 + 15874^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41459 + ... + 50618.

It is an arithmetic number, because the mean of its divisors is an integer number (37061395).

Almost surely, 2^421712660 is an apocalyptic number.

It is an amenable number.

421712660 is an abundant number, since it is smaller than the sum of its proper divisors (467760820).

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

421712660 is a wasteful number, since it uses less digits than its factorization.

421712660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92315 (or 92313 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 421712660 is about 20535.6436470835. The cubic root of 421712660 is about 749.9037861762.

Adding to 421712660 its reverse (66217124), we get a palindrome (487929784).

The spelling of 421712660 in words is "four hundred twenty-one million, seven hundred twelve thousand, six hundred sixty".