620856889 has 3 divisors (see below), whose sum is σ = 620881807. Its totient is φ = 620831972.
The previous prime is 620856883. The next prime is 620856923. The reversal of 620856889 is 988658026.
The square root of 620856889 is 24917.
It is a perfect power (a square), and thus also a powerful number.
It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.
It can be written as a sum of positive squares in only one way, i.e., 427869225 + 192987664 = 20685^2 + 13892^2 .
It is not a de Polignac number, because 620856889 - 29 = 620856377 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (620856883) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 12459 + ... + 37375.
Almost surely, 2620856889 is an apocalyptic number.
620856889 is the 24917-th square number.
620856889 is the 12459-th centered octagonal number.
It is an amenable number.
620856889 is a deficient number, since it is larger than the sum of its proper divisors (24918).
620856889 is an frugal number, since it uses more digits than its factorization.
620856889 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 49834 (or 24917 counting only the distinct ones).
The product of its (nonzero) digits is 1658880, while the sum is 52.
The cubic root of 620856889 is about 853.0945512960.
The spelling of 620856889 in words is "six hundred twenty million, eight hundred fifty-six thousand, eight hundred eighty-nine".
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