628157711 has 4 divisors (see below), whose sum is σ = 628389624. Its totient is φ = 627925800.

The previous prime is 628157659. The next prime is 628157753. The reversal of 628157711 is 117751826.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 628157711 - 2¹⁰ = 628156687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628157311) 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, 111845 + ... + 117326.

It is an arithmetic number, because the mean of its divisors is an integer number (157097406).

Almost surely, 2^628157711 is an apocalyptic number.

628157711 is a deficient number, since it is larger than the sum of its proper divisors (231913).

628157711 is a wasteful number, since it uses less digits than its factorization.

628157711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231912.

The product of its digits is 23520, while the sum is 38.

The square root of 628157711 is about 25063.0746517661. The cubic root of 628157711 is about 856.4254511369.

The spelling of 628157711 in words is "six hundred twenty-eight million, one hundred fifty-seven thousand, seven hundred eleven".