628011057 has 4 divisors (see below), whose sum is σ = 837348080. Its totient is φ = 418674036.

The previous prime is 628011049. The next prime is 628011061. The reversal of 628011057 is 750110826.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 628011057 - 2³ = 628011049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628011157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104668507 + ... + 104668512.

It is an arithmetic number, because the mean of its divisors is an integer number (209337020).

Almost surely, 2^628011057 is an apocalyptic number.

It is an amenable number.

628011057 is a deficient number, since it is larger than the sum of its proper divisors (209337023).

628011057 is a wasteful number, since it uses less digits than its factorization.

628011057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209337022.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 628011057 is about 25060.1487824793. The cubic root of 628011057 is about 856.3587969663.

The spelling of 628011057 in words is "six hundred twenty-eight million, eleven thousand, fifty-seven".