621688361 has 8 divisors (see below), whose sum is σ = 711031680. Its totient is φ = 532477728.

The previous prime is 621688339. The next prime is 621688373. The reversal of 621688361 is 163886126.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621688361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621688391) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 22916 + ... + 42053.

It is an arithmetic number, because the mean of its divisors is an integer number (88878960).

Almost surely, 2^621688361 is an apocalyptic number.

It is an amenable number.

621688361 is a deficient number, since it is larger than the sum of its proper divisors (89343319).

621688361 is a wasteful number, since it uses less digits than its factorization.

621688361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66343.

The product of its digits is 82944, while the sum is 41.

The square root of 621688361 is about 24933.6792511655. The cubic root of 621688361 is about 853.4752121915.

The spelling of 621688361 in words is "six hundred twenty-one million, six hundred eighty-eight thousand, three hundred sixty-one".