628294557 has 16 divisors (see below), whose sum is σ = 921441600. Its totient is φ = 380782160.

The previous prime is 628294553. The next prime is 628294559. The reversal of 628294557 is 755492826.

628294557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 628294557 - 2² = 628294553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628294553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74682 + ... + 82667.

It is an arithmetic number, because the mean of its divisors is an integer number (57590100).

Almost surely, 2^628294557 is an apocalyptic number.

It is an amenable number.

628294557 is a deficient number, since it is larger than the sum of its proper divisors (293147043).

628294557 is a wasteful number, since it uses less digits than its factorization.

628294557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157385 (or 157363 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 48.

The square root of 628294557 is about 25065.8045352628. The cubic root of 628294557 is about 856.4876382202.

The spelling of 628294557 in words is "six hundred twenty-eight million, two hundred ninety-four thousand, five hundred fifty-seven".