7680021 has 8 divisors (see below), whose sum is σ = 10253280. Its totient is φ = 5113392.

The previous prime is 7680019. The next prime is 7680037. The reversal of 7680021 is 1200867.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7680021 - 2¹ = 7680019 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7679973 and 7680000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7681021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2646 + ... + 4728.

It is an arithmetic number, because the mean of its divisors is an integer number (1281660).

Almost surely, 2^7680021 is an apocalyptic number.

It is an amenable number.

7680021 is a deficient number, since it is larger than the sum of its proper divisors (2573259).

7680021 is a wasteful number, since it uses less digits than its factorization.

7680021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3315.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 7680021 is about 2771.2850809688. The cubic root of 7680021 is about 197.2971457742.

Adding to 7680021 its reverse (1200867), we get a palindrome (8880888).

The spelling of 7680021 in words is "seven million, six hundred eighty thousand, twenty-one".