628400489971 has 2 divisors, whose sum is σ = 628400489972. Its totient is φ = 628400489970.

The previous prime is 628400489939. The next prime is 628400489987. The reversal of 628400489971 is 179984004826.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 628400489971 - 2⁵ = 628400489939 is a prime.

It is not a weakly prime, because it can be changed into another prime (628400489921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314200244985 + 314200244986.

It is an arithmetic number, because the mean of its divisors is an integer number (314200244986).

Almost surely, 2^628400489971 is an apocalyptic number.

628400489971 is a deficient number, since it is larger than the sum of its proper divisors (1).

628400489971 is an equidigital number, since it uses as much as digits as its factorization.

628400489971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6967296, while the sum is 58.

The spelling of 628400489971 in words is "six hundred twenty-eight billion, four hundred million, four hundred eighty-nine thousand, nine hundred seventy-one".