7689702421 has 2 divisors, whose sum is σ = 7689702422. Its totient is φ = 7689702420.

The previous prime is 7689702373. The next prime is 7689702443. The reversal of 7689702421 is 1242079867.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7206142321 + 483560100 = 84889^2 + 21990^2 .

It is a cyclic number.

It is not a de Polignac number, because 7689702421 - 2¹¹ = 7689700373 is a prime.

It is a super-2 number, since 2×7689702421² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7689702121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3844851210 + 3844851211.

It is an arithmetic number, because the mean of its divisors is an integer number (3844851211).

Almost surely, 2^7689702421 is an apocalyptic number.

It is an amenable number.

7689702421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7689702421 is an equidigital number, since it uses as much as digits as its factorization.

7689702421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 46.

The square root of 7689702421 is about 87690.9483413197. The cubic root of 7689702421 is about 1973.8001510763.

The spelling of 7689702421 in words is "seven billion, six hundred eighty-nine million, seven hundred two thousand, four hundred twenty-one".