628477987 has 2 divisors, whose sum is σ = 628477988. Its totient is φ = 628477986.

The previous prime is 628477979. The next prime is 628477999. The reversal of 628477987 is 789774826.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 628477987 - 2³ = 628477979 is a prime.

It is not a weakly prime, because it can be changed into another prime (628477907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314238993 + 314238994.

It is an arithmetic number, because the mean of its divisors is an integer number (314238994).

Almost surely, 2^628477987 is an apocalyptic number.

628477987 is a deficient number, since it is larger than the sum of its proper divisors (1).

628477987 is an equidigital number, since it uses as much as digits as its factorization.

628477987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9483264, while the sum is 58.

The square root of 628477987 is about 25069.4632371736. The cubic root of 628477987 is about 856.5709803613.

The spelling of 628477987 in words is "six hundred twenty-eight million, four hundred seventy-seven thousand, nine hundred eighty-seven".