628193818820 has 24 divisors (see below), whose sum is σ = 1319254107864. Its totient is φ = 251268558336.

The previous prime is 628193818793. The next prime is 628193818823. The reversal of 628193818820 is 28818391826.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 208123914436 + 420069904384 = 456206^2 + 648128^2 .

It is not an unprimeable number, because it can be changed into a prime (628193818823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28862 + ... + 1121258.

It is an arithmetic number, because the mean of its divisors is an integer number (54968921161).

Almost surely, 2^628193818820 is an apocalyptic number.

It is an amenable number.

628193818820 is an abundant number, since it is smaller than the sum of its proper divisors (691060289044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

628193818820 is a wasteful number, since it uses less digits than its factorization.

628193818820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121159 (or 1121157 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 56.

The spelling of 628193818820 in words is "six hundred twenty-eight billion, one hundred ninety-three million, eight hundred eighteen thousand, eight hundred twenty".