628081 has 4 divisors (see below), whose sum is σ = 630000. Its totient is φ = 626164.

The previous prime is 628063. The next prime is 628093. The reversal of 628081 is 180826.

628081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 628081 - 2⁵ = 628049 is a prime.

It is a super-2 number, since 2×628081² = 788971485122, which contains 22 as substring.

It is a Duffinian number.

628081 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (628021) 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, 331 + ... + 1168.

It is an arithmetic number, because the mean of its divisors is an integer number (157500).

2⁶²⁸⁰⁸¹ is an apocalyptic number.

It is an amenable number.

628081 is a deficient number, since it is larger than the sum of its proper divisors (1919).

628081 is a wasteful number, since it uses less digits than its factorization.

628081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1918.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 628081 is about 792.5156149881. The cubic root of 628081 is about 85.6390587319.

Adding to 628081 its product of nonzero digits (768), we get a square (628849 = 793²).

The spelling of 628081 in words is "six hundred twenty-eight thousand, eighty-one".