1628641877 has 2 divisors, whose sum is σ = 1628641878. Its totient is φ = 1628641876.

The previous prime is 1628641873. The next prime is 1628641879. The reversal of 1628641877 is 7781468261.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1373888356 + 254753521 = 37066^2 + 15961^2 .

It is a cyclic number.

It is not a de Polignac number, because 1628641877 - 2² = 1628641873 is a prime.

Together with 1628641879, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1628641873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 814320938 + 814320939.

It is an arithmetic number, because the mean of its divisors is an integer number (814320939).

Almost surely, 2^1628641877 is an apocalyptic number.

It is an amenable number.

1628641877 is a deficient number, since it is larger than the sum of its proper divisors (1).

1628641877 is an equidigital number, since it uses as much as digits as its factorization.

1628641877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 903168, while the sum is 50.

The square root of 1628641877 is about 40356.4353852022. The cubic root of 1628641877 is about 1176.5449728312.

The spelling of 1628641877 in words is "one billion, six hundred twenty-eight million, six hundred forty-one thousand, eight hundred seventy-seven".