421640650 has 12 divisors (see below), whose sum is σ = 784251702. Its totient is φ = 168656240.

The previous prime is 421640621. The next prime is 421640651. The reversal of 421640650 is 56046124.

It can be written as a sum of positive squares in 3 ways, for example, as 310570129 + 111070521 = 17623^2 + 10539^2 .

It is not an unprimeable number, because it can be changed into a prime (421640651) 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, 4216357 + ... + 4216456.

Almost surely, 2^421640650 is an apocalyptic number.

421640650 is a deficient number, since it is larger than the sum of its proper divisors (362611052).

421640650 is a wasteful number, since it uses less digits than its factorization.

421640650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8432825 (or 8432820 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 421640650 is about 20533.8902792432. The cubic root of 421640650 is about 749.8611002033.

Adding to 421640650 its reverse (56046124), we get a palindrome (477686774).

The spelling of 421640650 in words is "four hundred twenty-one million, six hundred forty thousand, six hundred fifty".