628007778 has 48 divisors (see below), whose sum is σ = 1503380736. Its totient is φ = 188453760.

The previous prime is 628007777. The next prime is 628007803. The reversal of 628007778 is 877700826.

628007778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (628007777) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37578 + ... + 51653.

It is an arithmetic number, because the mean of its divisors is an integer number (31320432).

Almost surely, 2^628007778 is an apocalyptic number.

628007778 is an abundant number, since it is smaller than the sum of its proper divisors (875372958).

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

628007778 is a wasteful number, since it uses less digits than its factorization.

628007778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89279 (or 89276 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 45.

The square root of 628007778 is about 25060.0833597975. The cubic root of 628007778 is about 856.3573065438.

The spelling of 628007778 in words is "six hundred twenty-eight million, seven thousand, seven hundred seventy-eight".