628415987 has 2 divisors, whose sum is σ = 628415988. Its totient is φ = 628415986.

The previous prime is 628415971. The next prime is 628416017. The reversal of 628415987 is 789514826.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 628415987 - 2⁴ = 628415971 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (628415927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314207993 + 314207994.

It is an arithmetic number, because the mean of its divisors is an integer number (314207994).

Almost surely, 2^628415987 is an apocalyptic number.

628415987 is a deficient number, since it is larger than the sum of its proper divisors (1).

628415987 is an equidigital number, since it uses as much as digits as its factorization.

628415987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 967680, while the sum is 50.

The square root of 628415987 is about 25068.2266425050. The cubic root of 628415987 is about 856.5428122322.

The spelling of 628415987 in words is "six hundred twenty-eight million, four hundred fifteen thousand, nine hundred eighty-seven".