628638518 has 4 divisors (see below), whose sum is σ = 942957780. Its totient is φ = 314319258.

The previous prime is 628638511. The next prime is 628638523. The reversal of 628638518 is 815836826.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628638511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157159628 + ... + 157159631.

It is an arithmetic number, because the mean of its divisors is an integer number (235739445).

Almost surely, 2^628638518 is an apocalyptic number.

628638518 is a deficient number, since it is larger than the sum of its proper divisors (314319262).

628638518 is a wasteful number, since it uses less digits than its factorization.

628638518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314319261.

The product of its digits is 552960, while the sum is 47.

The square root of 628638518 is about 25072.6647566628. The cubic root of 628638518 is about 856.6439049468.

The spelling of 628638518 in words is "six hundred twenty-eight million, six hundred thirty-eight thousand, five hundred eighteen".