628711257 has 8 divisors (see below), whose sum is σ = 852490080. Its totient is φ = 412036640.

The previous prime is 628711253. The next prime is 628711267. The reversal of 628711257 is 752117826.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 628711257 - 2² = 628711253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (628711253) 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, 1775844 + ... + 1776197.

It is an arithmetic number, because the mean of its divisors is an integer number (106561260).

Almost surely, 2^628711257 is an apocalyptic number.

It is an amenable number.

628711257 is a deficient number, since it is larger than the sum of its proper divisors (223778823).

628711257 is a wasteful number, since it uses less digits than its factorization.

628711257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3552103.

The product of its digits is 47040, while the sum is 39.

The square root of 628711257 is about 25074.1152785098. The cubic root of 628711257 is about 856.6769440814.

The spelling of 628711257 in words is "six hundred twenty-eight million, seven hundred eleven thousand, two hundred fifty-seven".