628777 has 4 divisors (see below), whose sum is σ = 633856. Its totient is φ = 623700.

The previous prime is 628759. The next prime is 628781. The reversal of 628777 is 777826.

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 a cyclic number.

It is not a de Polignac number, because 628777 - 2¹⁵ = 596009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628757) 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, 2349 + ... + 2602.

It is an arithmetic number, because the mean of its divisors is an integer number (158464).

2⁶²⁸⁷⁷⁷ is an apocalyptic number.

It is an amenable number.

628777 is a deficient number, since it is larger than the sum of its proper divisors (5079).

628777 is a wasteful number, since it uses less digits than its factorization.

628777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5078.

The product of its digits is 32928, while the sum is 37.

The square root of 628777 is about 792.9546014748. The cubic root of 628777 is about 85.6706803336.

The spelling of 628777 in words is "six hundred twenty-eight thousand, seven hundred seventy-seven".