628343347981 has 2 divisors, whose sum is σ = 628343347982. Its totient is φ = 628343347980.

The previous prime is 628343347909. The next prime is 628343347993. The reversal of 628343347981 is 189743343826.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 419942880900 + 208400467081 = 648030^2 + 456509^2 .

It is a cyclic number.

It is not a de Polignac number, because 628343347981 - 2⁹ = 628343347469 is a prime.

It is a super-2 number, since 2×628343347981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628343347081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314171673990 + 314171673991.

It is an arithmetic number, because the mean of its divisors is an integer number (314171673991).

Almost surely, 2^628343347981 is an apocalyptic number.

It is an amenable number.

628343347981 is a deficient number, since it is larger than the sum of its proper divisors (1).

628343347981 is an equidigital number, since it uses as much as digits as its factorization.

628343347981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20901888, while the sum is 58.

The spelling of 628343347981 in words is "six hundred twenty-eight billion, three hundred forty-three million, three hundred forty-seven thousand, nine hundred eighty-one".