628287813 has 32 divisors (see below), whose sum is σ = 986428800. Its totient is φ = 394531200.

The previous prime is 628287809. The next prime is 628287817. The reversal of 628287813 is 318782826.

628287813 is a `hidden beast` number, since 628 + 2 + 8 + 7 + 8 + 13 = 666.

628287813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (628287809) and next prime (628287817).

It is not a de Polignac number, because 628287813 - 2² = 628287809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628287817) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22318 + ... + 41888.

It is an arithmetic number, because the mean of its divisors is an integer number (30825900).

Almost surely, 2^628287813 is an apocalyptic number.

It is an amenable number.

628287813 is a deficient number, since it is larger than the sum of its proper divisors (358140987).

628287813 is a wasteful number, since it uses less digits than its factorization.

628287813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19650 (or 19644 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 628287813 is about 25065.6700089984. The cubic root of 628287813 is about 856.4845737481.

The spelling of 628287813 in words is "six hundred twenty-eight million, two hundred eighty-seven thousand, eight hundred thirteen".