628824881 has 2 divisors, whose sum is σ = 628824882. Its totient is φ = 628824880.

The previous prime is 628824871. The next prime is 628824887. The reversal of 628824881 is 188428826.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 609102400 + 19722481 = 24680^2 + 4441^2 .

It is a cyclic number.

It is not a de Polignac number, because 628824881 - 2²⁶ = 561716017 is a prime.

It is a super-2 number, since 2×628824881² = 790841461929328322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (628824887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314412440 + 314412441.

It is an arithmetic number, because the mean of its divisors is an integer number (314412441).

Almost surely, 2^628824881 is an apocalyptic number.

It is an amenable number.

628824881 is a deficient number, since it is larger than the sum of its proper divisors (1).

628824881 is an equidigital number, since it uses as much as digits as its factorization.

628824881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 393216, while the sum is 47.

The square root of 628824881 is about 25076.3809390430. The cubic root of 628824881 is about 856.7285486915.

The spelling of 628824881 in words is "six hundred twenty-eight million, eight hundred twenty-four thousand, eight hundred eighty-one".