7642862621 has 2 divisors, whose sum is σ = 7642862622. Its totient is φ = 7642862620.

The previous prime is 7642862593. The next prime is 7642862693. The reversal of 7642862621 is 1262682467.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7411488100 + 231374521 = 86090^2 + 15211^2 .

It is an emirp because it is prime and its reverse (1262682467) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7642862621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7642862021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3821431310 + 3821431311.

It is an arithmetic number, because the mean of its divisors is an integer number (3821431311).

Almost surely, 2^7642862621 is an apocalyptic number.

It is an amenable number.

7642862621 is a deficient number, since it is larger than the sum of its proper divisors (1).

7642862621 is an equidigital number, since it uses as much as digits as its factorization.

7642862621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 44.

The square root of 7642862621 is about 87423.4672213359. The cubic root of 7642862621 is about 1969.7843581117.

The spelling of 7642862621 in words is "seven billion, six hundred forty-two million, eight hundred sixty-two thousand, six hundred twenty-one".