628435957 has 4 divisors (see below), whose sum is σ = 665402796. Its totient is φ = 591469120.

The previous prime is 628435949. The next prime is 628435961. The reversal of 628435957 is 759534826.

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 228795876 + 399640081 = 15126^2 + 19991^2 .

It is a cyclic number.

It is not a de Polignac number, because 628435957 - 2³ = 628435949 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 628435957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628435967) 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, 18483394 + ... + 18483427.

It is an arithmetic number, because the mean of its divisors is an integer number (166350699).

Almost surely, 2^628435957 is an apocalyptic number.

It is an amenable number.

628435957 is a deficient number, since it is larger than the sum of its proper divisors (36966839).

628435957 is a wasteful number, since it uses less digits than its factorization.

628435957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36966838.

The product of its digits is 1814400, while the sum is 49.

The square root of 628435957 is about 25068.6249523184. The cubic root of 628435957 is about 856.5518852980.

The spelling of 628435957 in words is "six hundred twenty-eight million, four hundred thirty-five thousand, nine hundred fifty-seven".