7685828121 has 4 divisors (see below), whose sum is σ = 10247770832. Its totient is φ = 5123885412.

The previous prime is 7685828113. The next prime is 7685828147. The reversal of 7685828121 is 1218285867.

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 not a de Polignac number, because 7685828121 - 2³ = 7685828113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7685828021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1280971351 + ... + 1280971356.

It is an arithmetic number, because the mean of its divisors is an integer number (2561942708).

Almost surely, 2^7685828121 is an apocalyptic number.

It is an amenable number.

7685828121 is a deficient number, since it is larger than the sum of its proper divisors (2561942711).

7685828121 is a wasteful number, since it uses less digits than its factorization.

7685828121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2561942710.

The product of its digits is 430080, while the sum is 48.

The square root of 7685828121 is about 87668.8549086846. The cubic root of 7685828121 is about 1973.4686090502.

The spelling of 7685828121 in words is "seven billion, six hundred eighty-five million, eight hundred twenty-eight thousand, one hundred twenty-one".