621208678 has 16 divisors (see below), whose sum is σ = 946144800. Its totient is φ = 305838400.

The previous prime is 621208669. The next prime is 621208691. The reversal of 621208678 is 876802126.

It is a self number, because there is not a number n which added to its sum of digits gives 621208678.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 131298 + ... + 135946.

It is an arithmetic number, because the mean of its divisors is an integer number (59134050).

Almost surely, 2^621208678 is an apocalyptic number.

621208678 is a deficient number, since it is larger than the sum of its proper divisors (324936122).

621208678 is a wasteful number, since it uses less digits than its factorization.

621208678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5663.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 621208678 is about 24924.0582169116. The cubic root of 621208678 is about 853.2556472586.

The spelling of 621208678 in words is "six hundred twenty-one million, two hundred eight thousand, six hundred seventy-eight".