628081387 has 2 divisors, whose sum is σ = 628081388. Its totient is φ = 628081386.

The previous prime is 628081381. The next prime is 628081397. The reversal of 628081387 is 783180826.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628081387 is a prime.

It is not a weakly prime, because it can be changed into another prime (628081381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314040693 + 314040694.

It is an arithmetic number, because the mean of its divisors is an integer number (314040694).

Almost surely, 2^628081387 is an apocalyptic number.

628081387 is a deficient number, since it is larger than the sum of its proper divisors (1).

628081387 is an equidigital number, since it uses as much as digits as its factorization.

628081387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 628081387 is about 25061.5519671069. The cubic root of 628081387 is about 856.3907632113.

The spelling of 628081387 in words is "six hundred twenty-eight million, eighty-one thousand, three hundred eighty-seven".