642483621 has 12 divisors (see below), whose sum is σ = 999419148. Its totient is φ = 395374464.

The previous prime is 642483619. The next prime is 642483637. The reversal of 642483621 is 126384246.

642483621 is a `hidden beast` number, since 6 + 4 + 24 + 8 + 3 + 621 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 53450721 + 589032900 = 7311^2 + 24270^2 .

It is not a de Polignac number, because 642483621 - 2¹ = 642483619 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642483641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2745540 + ... + 2745773.

It is an arithmetic number, because the mean of its divisors is an integer number (83284929).

Almost surely, 2^642483621 is an apocalyptic number.

It is an amenable number.

642483621 is a deficient number, since it is larger than the sum of its proper divisors (356935527).

642483621 is a wasteful number, since it uses less digits than its factorization.

642483621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5491332 (or 5491329 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 642483621 is about 25347.2606212190. The cubic root of 642483621 is about 862.8871869675.

The spelling of 642483621 in words is "six hundred forty-two million, four hundred eighty-three thousand, six hundred twenty-one".