621620998 has 8 divisors (see below), whose sum is σ = 935074008. Its totient is φ = 309929664.

The previous prime is 621620969. The next prime is 621620999. The reversal of 621620998 is 899026126.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621620999) 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 3 ways as a sum of consecutive naturals, for example, 439536 + ... + 440947.

It is an arithmetic number, because the mean of its divisors is an integer number (116884251).

Almost surely, 2^621620998 is an apocalyptic number.

621620998 is a deficient number, since it is larger than the sum of its proper divisors (313453010).

621620998 is a wasteful number, since it uses less digits than its factorization.

621620998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880838.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 621620998 is about 24932.3283710126. The cubic root of 621620998 is about 853.4443849952. Note that the first 3 decimals are identical.

The spelling of 621620998 in words is "six hundred twenty-one million, six hundred twenty thousand, nine hundred ninety-eight".