621721682 has 8 divisors (see below), whose sum is σ = 933171276. Its totient is φ = 310664592.

The previous prime is 621721673. The next prime is 621721697. The reversal of 621721682 is 286127126.

It can be written as a sum of positive squares in 2 ways, for example, as 613998841 + 7722841 = 24779^2 + 2779^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94133 + ... + 100520.

Almost surely, 2^621721682 is an apocalyptic number.

621721682 is a deficient number, since it is larger than the sum of its proper divisors (311449594).

621721682 is a wasteful number, since it uses less digits than its factorization.

621721682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196252.

The product of its digits is 16128, while the sum is 35.

The square root of 621721682 is about 24934.3474348137. The cubic root of 621721682 is about 853.4904599916.

The spelling of 621721682 in words is "six hundred twenty-one million, seven hundred twenty-one thousand, six hundred eighty-two".