621364646 has 16 divisors (see below), whose sum is σ = 1067986944. Its totient is φ = 265601544.

The previous prime is 621364621. The next prime is 621364649. The reversal of 621364646 is 646463126.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621364649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52580 + ... + 63303.

It is an arithmetic number, because the mean of its divisors is an integer number (66749184).

Almost surely, 2^621364646 is an apocalyptic number.

621364646 is a deficient number, since it is larger than the sum of its proper divisors (446622298).

621364646 is a wasteful number, since it uses less digits than its factorization.

621364646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116275.

The product of its digits is 124416, while the sum is 38.

The square root of 621364646 is about 24927.1868850057. The cubic root of 621364646 is about 853.3270507689.

The spelling of 621364646 in words is "six hundred twenty-one million, three hundred sixty-four thousand, six hundred forty-six".