7688621 has 4 divisors (see below), whose sum is σ = 7775100. Its totient is φ = 7602144.

The previous prime is 7688591. The next prime is 7688627. The reversal of 7688621 is 1268867.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 855625 + 6832996 = 925^2 + 2614^2 .

It is a cyclic number.

It is not a de Polignac number, because 7688621 - 2¹⁸ = 7426477 is a prime.

It is a super-2 number, since 2×7688621² = 118229785763282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7688627) 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, 43106 + ... + 43283.

It is an arithmetic number, because the mean of its divisors is an integer number (1943775).

Almost surely, 2^7688621 is an apocalyptic number.

It is an amenable number.

7688621 is a deficient number, since it is larger than the sum of its proper divisors (86479).

7688621 is an equidigital number, since it uses as much as digits as its factorization.

7688621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86478.

The product of its digits is 32256, while the sum is 38.

The square root of 7688621 is about 2772.8362735654. The cubic root of 7688621 is about 197.3707620014.

The spelling of 7688621 in words is "seven million, six hundred eighty-eight thousand, six hundred twenty-one".