621690668 has 6 divisors (see below), whose sum is σ = 1087958676. Its totient is φ = 310845332.

The previous prime is 621690649. The next prime is 621690677. The reversal of 621690668 is 866096126.

621690668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77711330 + ... + 77711337.

It is an arithmetic number, because the mean of its divisors is an integer number (181326446).

Almost surely, 2^621690668 is an apocalyptic number.

It is an amenable number.

621690668 is a deficient number, since it is larger than the sum of its proper divisors (466268008).

621690668 is a wasteful number, since it uses less digits than its factorization.

621690668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155422671 (or 155422669 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 621690668 is about 24933.7255138497. The cubic root of 621690668 is about 853.4762678999.

The spelling of 621690668 in words is "six hundred twenty-one million, six hundred ninety thousand, six hundred sixty-eight".