768538621 has 2 divisors, whose sum is σ = 768538622. Its totient is φ = 768538620.

The previous prime is 768538607. The next prime is 768538633. The reversal of 768538621 is 126835867.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 405216900 + 363321721 = 20130^2 + 19061^2 .

It is a cyclic number.

It is not a de Polignac number, because 768538621 - 2¹⁵ = 768505853 is a prime.

It is a super-2 number, since 2×768538621² = 1181303223937163282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (768530621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 384269310 + 384269311.

It is an arithmetic number, because the mean of its divisors is an integer number (384269311).

Almost surely, 2^768538621 is an apocalyptic number.

It is an amenable number.

768538621 is a deficient number, since it is larger than the sum of its proper divisors (1).

768538621 is an equidigital number, since it uses as much as digits as its factorization.

768538621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 46.

The square root of 768538621 is about 27722.5291234404. The cubic root of 768538621 is about 915.9854298230.

The spelling of 768538621 in words is "seven hundred sixty-eight million, five hundred thirty-eight thousand, six hundred twenty-one".