642622450 has 24 divisors (see below), whose sum is σ = 1201488948. Its totient is φ = 255713280.

The previous prime is 642622441. The next prime is 642622469. The reversal of 642622450 is 54226246.

It can be written as a sum of positive squares in 6 ways, for example, as 120362841 + 522259609 = 10971^2 + 22853^2 .

It is a super-2 number, since 2×642622450² = 825927226488005000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23647 + ... + 42946.

Almost surely, 2^642622450 is an apocalyptic number.

642622450 is a deficient number, since it is larger than the sum of its proper divisors (558866498).

642622450 is a wasteful number, since it uses less digits than its factorization.

642622450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66798 (or 66793 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 31.

The square root of 642622450 is about 25349.9990138067. Note that the first 3 decimals coincide. The cubic root of 642622450 is about 862.9493338892.

Adding to 642622450 its reverse (54226246), we get a palindrome (696848696).

The spelling of 642622450 in words is "six hundred forty-two million, six hundred twenty-two thousand, four hundred fifty".