628157 has 4 divisors (see below), whose sum is σ = 632316. Its totient is φ = 624000.

The previous prime is 628139. The next prime is 628171. The reversal of 628157 is 751826.

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

It can be written as a sum of positive squares in 2 ways, for example, as 89401 + 538756 = 299^2 + 734^2 .

It is a cyclic number.

It is not a de Polignac number, because 628157 - 2⁶ = 628093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 628157.

It is not an unprimeable number, because it can be changed into a prime (628127) 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, 1844 + ... + 2157.

It is an arithmetic number, because the mean of its divisors is an integer number (158079).

2⁶²⁸¹⁵⁷ is an apocalyptic number.

It is an amenable number.

628157 is a deficient number, since it is larger than the sum of its proper divisors (4159).

628157 is a wasteful number, since it uses less digits than its factorization.

628157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4158.

The product of its digits is 3360, while the sum is 29.

The square root of 628157 is about 792.5635621198. The cubic root of 628157 is about 85.6425128013.

It can be divided in two parts, 628 and 157, that multiplied together give a square (98596 = 314²).

The spelling of 628157 in words is "six hundred twenty-eight thousand, one hundred fifty-seven".