7663821 has 32 divisors (see below), whose sum is σ = 12441600. Its totient is φ = 4135680.

The previous prime is 7663813. The next prime is 7663823. The reversal of 7663821 is 1283667.

It is not a de Polignac number, because 7663821 - 2³ = 7663813 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a d-powerful number, because it can be written as 7⁸ + 6⁴ + 6⁸ + 3¹¹ + 8⁵ + 2¹³ + 1 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7663823) 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 31 ways as a sum of consecutive naturals, for example, 10300 + ... + 11018.

It is an arithmetic number, because the mean of its divisors is an integer number (388800).

Almost surely, 2^7663821 is an apocalyptic number.

It is an amenable number.

7663821 is a deficient number, since it is larger than the sum of its proper divisors (4777779).

7663821 is a wasteful number, since it uses less digits than its factorization.

7663821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769.

The product of its digits is 12096, while the sum is 33.

The square root of 7663821 is about 2768.3607062664. The cubic root of 7663821 is about 197.1583239433.

The spelling of 7663821 in words is "seven million, six hundred sixty-three thousand, eight hundred twenty-one".