628887438 has 24 divisors (see below), whose sum is σ = 1395824976. Its totient is φ = 204516000.

The previous prime is 628887437. The next prime is 628887451. The reversal of 628887438 is 834788826.

628887438 is a `hidden beast` number, since 628 + 8 + 8 + 7 + 4 + 3 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628887437) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 425338 + ... + 426813.

It is an arithmetic number, because the mean of its divisors is an integer number (58159374).

Almost surely, 2^628887438 is an apocalyptic number.

628887438 is an abundant number, since it is smaller than the sum of its proper divisors (766937538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

628887438 is a wasteful number, since it uses less digits than its factorization.

628887438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852200 (or 852197 counting only the distinct ones).

The product of its digits is 4128768, while the sum is 54.

The square root of 628887438 is about 25077.6282371360. The cubic root of 628887438 is about 856.7569575497.

The spelling of 628887438 in words is "six hundred twenty-eight million, eight hundred eighty-seven thousand, four hundred thirty-eight".