628417557 has 6 divisors (see below), whose sum is σ = 907714262. Its totient is φ = 418945032.

The previous prime is 628417549. The next prime is 628417561. The reversal of 628417557 is 755714826.

628417557 is a `hidden beast` number, since 6 + 2 + 84 + 17 + 557 = 666.

It can be written as a sum of positive squares in only one way, i.e., 421316676 + 207100881 = 20526^2 + 14391^2 .

It is not a de Polignac number, because 628417557 - 2³ = 628417549 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 (628417577) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34912078 + ... + 34912095.

Almost surely, 2^628417557 is an apocalyptic number.

It is an amenable number.

628417557 is a deficient number, since it is larger than the sum of its proper divisors (279296705).

628417557 is a wasteful number, since it uses less digits than its factorization.

628417557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69824179 (or 69824176 counting only the distinct ones).

The product of its digits is 470400, while the sum is 45.

The square root of 628417557 is about 25068.2579570261. The cubic root of 628417557 is about 856.5435255448.

The spelling of 628417557 in words is "six hundred twenty-eight million, four hundred seventeen thousand, five hundred fifty-seven".