628263729 has 8 divisors (see below), whose sum is σ = 930761120. Its totient is φ = 418842468.

The previous prime is 628263721. The next prime is 628263731. The reversal of 628263729 is 927362826.

628263729 is a `hidden beast` number, since 6 + 2 + 8 + 2 + 637 + 2 + 9 = 666.

It is not a de Polignac number, because 628263729 - 2³ = 628263721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628263721) 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, 11634487 + ... + 11634540.

It is an arithmetic number, because the mean of its divisors is an integer number (116345140).

Almost surely, 2^628263729 is an apocalyptic number.

It is an amenable number.

628263729 is a deficient number, since it is larger than the sum of its proper divisors (302497391).

628263729 is a wasteful number, since it uses less digits than its factorization.

628263729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23269036 (or 23269030 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 628263729 is about 25065.1895863566. The cubic root of 628263729 is about 856.4736298051.

The spelling of 628263729 in words is "six hundred twenty-eight million, two hundred sixty-three thousand, seven hundred twenty-nine".