620838655 has 8 divisors (see below), whose sum is σ = 777398112. Its totient is φ = 475076448.

The previous prime is 620838649. The next prime is 620838667. The reversal of 620838655 is 556838026.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 620838655 - 2⁷ = 620838527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2699184 + ... + 2699413.

It is an arithmetic number, because the mean of its divisors is an integer number (97174764).

Almost surely, 2^620838655 is an apocalyptic number.

620838655 is a deficient number, since it is larger than the sum of its proper divisors (156559457).

620838655 is a wasteful number, since it uses less digits than its factorization.

620838655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5398625.

The product of its (nonzero) digits is 345600, while the sum is 43.

The square root of 620838655 is about 24916.6341025428. The cubic root of 620838655 is about 853.0861996782.

The spelling of 620838655 in words is "six hundred twenty million, eight hundred thirty-eight thousand, six hundred fifty-five".