628821890 has 8 divisors (see below), whose sum is σ = 1131879420. Its totient is φ = 251528752.

The previous prime is 628821871. The next prime is 628821899. The reversal of 628821890 is 98128826.

628821890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 600103009 + 28718881 = 24497^2 + 5359^2 .

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

It is not an unprimeable number, because it can be changed into a prime (628821899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31441085 + ... + 31441104.

Almost surely, 2^628821890 is an apocalyptic number.

628821890 is a deficient number, since it is larger than the sum of its proper divisors (503057530).

628821890 is a wasteful number, since it uses less digits than its factorization.

628821890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62882196.

The product of its (nonzero) digits is 110592, while the sum is 44.

The square root of 628821890 is about 25076.3213011797. The cubic root of 628821890 is about 856.7271903488.

The spelling of 628821890 in words is "six hundred twenty-eight million, eight hundred twenty-one thousand, eight hundred ninety".