628649287 has 8 divisors (see below), whose sum is σ = 718678400. Its totient is φ = 538675704.

The previous prime is 628649267. The next prime is 628649291. The reversal of 628649287 is 782946826.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 628649287 - 2¹⁹ = 628124999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628649237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14164 + ... + 38182.

It is an arithmetic number, because the mean of its divisors is an integer number (89834800).

Almost surely, 2^628649287 is an apocalyptic number.

628649287 is a deficient number, since it is larger than the sum of its proper divisors (90029113).

628649287 is a wasteful number, since it uses less digits than its factorization.

628649287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27765.

The product of its digits is 2322432, while the sum is 52.

The square root of 628649287 is about 25072.8795115360. The cubic root of 628649287 is about 856.6487965474.

The spelling of 628649287 in words is "six hundred twenty-eight million, six hundred forty-nine thousand, two hundred eighty-seven".