7642808421 has 4 divisors (see below), whose sum is σ = 10190411232. Its totient is φ = 5095205612.

The previous prime is 7642808377. The next prime is 7642808447. The reversal of 7642808421 is 1248082467.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7642808421 - 2¹³ = 7642800229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7642808521) 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 in 3 ways as a sum of consecutive naturals, for example, 1273801401 + ... + 1273801406.

It is an arithmetic number, because the mean of its divisors is an integer number (2547602808).

Almost surely, 2^7642808421 is an apocalyptic number.

It is an amenable number.

7642808421 is a deficient number, since it is larger than the sum of its proper divisors (2547602811).

7642808421 is a wasteful number, since it uses less digits than its factorization.

7642808421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2547602810.

The product of its (nonzero) digits is 172032, while the sum is 42.

The square root of 7642808421 is about 87423.1572353687. The cubic root of 7642808421 is about 1969.7797018038.

The spelling of 7642808421 in words is "seven billion, six hundred forty-two million, eight hundred eight thousand, four hundred twenty-one".