621648338 has 8 divisors (see below), whose sum is σ = 932813820. Its totient is φ = 310710400.

The previous prime is 621648331. The next prime is 621648341. The reversal of 621648338 is 833846126.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 596678329 + 24970009 = 24427^2 + 4997^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×621648338² = 772893312276324488, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 621648295 and 621648304.

It is not an unprimeable number, because it can be changed into a prime (621648331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49883 + ... + 61086.

Almost surely, 2^621648338 is an apocalyptic number.

621648338 is a deficient number, since it is larger than the sum of its proper divisors (311165482).

621648338 is a wasteful number, since it uses less digits than its factorization.

621648338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113772.

The product of its digits is 165888, while the sum is 41.

The square root of 621648338 is about 24932.8766491153. The cubic root of 621648338 is about 853.4568968138.

The spelling of 621648338 in words is "six hundred twenty-one million, six hundred forty-eight thousand, three hundred thirty-eight".