621644134 has 8 divisors (see below), whose sum is σ = 987317208. Its totient is φ = 292538400.

The previous prime is 621644059. The next prime is 621644171. The reversal of 621644134 is 431446126.

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

It is a junction number, because it is equal to n+sod(n) for n = 621644096 and 621644105.

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 3 ways as a sum of consecutive naturals, for example, 9141792 + ... + 9141859.

It is an arithmetic number, because the mean of its divisors is an integer number (123414651).

Almost surely, 2^621644134 is an apocalyptic number.

621644134 is a deficient number, since it is larger than the sum of its proper divisors (365673074).

621644134 is a wasteful number, since it uses less digits than its factorization.

621644134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18283670.

The product of its digits is 13824, while the sum is 31.

The square root of 621644134 is about 24932.7923426158. The cubic root of 621644134 is about 853.4549729282.

The spelling of 621644134 in words is "six hundred twenty-one million, six hundred forty-four thousand, one hundred thirty-four".