628461538 has 4 divisors (see below), whose sum is σ = 942692310. Its totient is φ = 314230768.

The previous prime is 628461521. The next prime is 628461551. The reversal of 628461538 is 835164826.

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

It can be written as a sum of positive squares in only one way, i.e., 595018449 + 33443089 = 24393^2 + 5783^2 .

It is a junction number, because it is equal to n+sod(n) for n = 628461494 and 628461503.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157115383 + ... + 157115386.

Almost surely, 2^628461538 is an apocalyptic number.

628461538 is a deficient number, since it is larger than the sum of its proper divisors (314230772).

628461538 is a wasteful number, since it uses less digits than its factorization.

628461538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314230771.

The product of its digits is 276480, while the sum is 43.

The square root of 628461538 is about 25069.1351665749. The cubic root of 628461538 is about 856.5635073555.

The spelling of 628461538 in words is "six hundred twenty-eight million, four hundred sixty-one thousand, five hundred thirty-eight".