623706728 has 32 divisors (see below), whose sum is σ = 1179648360. Its totient is φ = 309146880.

The previous prime is 623706697. The next prime is 623706731. The reversal of 623706728 is 827607326.

It can be written as a sum of positive squares in 4 ways, for example, as 623101444 + 605284 = 24962^2 + 778^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 587318 + ... + 588378.

Almost surely, 2^623706728 is an apocalyptic number.

It is an amenable number.

623706728 is a deficient number, since it is larger than the sum of its proper divisors (555941632).

623706728 is a wasteful number, since it uses less digits than its factorization.

623706728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1637 (or 1633 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 41.

The square root of 623706728 is about 24974.1211657187. The cubic root of 623706728 is about 854.3978423744.

The spelling of 623706728 in words is "six hundred twenty-three million, seven hundred six thousand, seven hundred twenty-eight".