7660821 has 8 divisors (see below), whose sum is σ = 11673664. Its totient is φ = 4377600.

The previous prime is 7660811. The next prime is 7660823. The reversal of 7660821 is 1280667.

It is a happy number.

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

It is not a de Polignac number, because 7660821 - 2⁹ = 7660309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7660823) 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, 182380 + ... + 182421.

It is an arithmetic number, because the mean of its divisors is an integer number (1459208).

Almost surely, 2^7660821 is an apocalyptic number.

It is an amenable number.

7660821 is a deficient number, since it is larger than the sum of its proper divisors (4012843).

7660821 is a wasteful number, since it uses less digits than its factorization.

7660821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364811.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 7660821 is about 2767.8188163245. The cubic root of 7660821 is about 197.1325947339.

The spelling of 7660821 in words is "seven million, six hundred sixty thousand, eight hundred twenty-one".