628209387 has 12 divisors (see below), whose sum is σ = 977214784. Its totient is φ = 386590320.

The previous prime is 628209383. The next prime is 628209391. The reversal of 628209387 is 783902826.

628209387 is a `hidden beast` number, since 62 + 8 + 209 + 387 = 666.

It is an interprime number because it is at equal distance from previous prime (628209383) and next prime (628209391).

It is not a de Polignac number, because 628209387 - 2² = 628209383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (628209383) 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, 2684539 + ... + 2684772.

Almost surely, 2^628209387 is an apocalyptic number.

628209387 is a deficient number, since it is larger than the sum of its proper divisors (349005397).

628209387 is a wasteful number, since it uses less digits than its factorization.

628209387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5369330 (or 5369327 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 628209387 is about 25064.1055495703. The cubic root of 628209387 is about 856.4489353815.

The spelling of 628209387 in words is "six hundred twenty-eight million, two hundred nine thousand, three hundred eighty-seven".