1628766761 has 2 divisors, whose sum is σ = 1628766762. Its totient is φ = 1628766760.

The previous prime is 1628766757. The next prime is 1628766847. The reversal of 1628766761 is 1676678261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1374555625 + 254211136 = 37075^2 + 15944^2 .

It is a cyclic number.

It is not a de Polignac number, because 1628766761 - 2² = 1628766757 is a prime.

It is a super-2 number, since 2×1628766761² = 5305762323476862242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1628766731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 814383380 + 814383381.

It is an arithmetic number, because the mean of its divisors is an integer number (814383381).

Almost surely, 2^1628766761 is an apocalyptic number.

It is an amenable number.

1628766761 is a deficient number, since it is larger than the sum of its proper divisors (1).

1628766761 is an equidigital number, since it uses as much as digits as its factorization.

1628766761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 50.

The square root of 1628766761 is about 40357.9826180645. The cubic root of 1628766761 is about 1176.5750444896.

The spelling of 1628766761 in words is "one billion, six hundred twenty-eight million, seven hundred sixty-six thousand, seven hundred sixty-one".