7664220 has 144 divisors (see below), whose sum is σ = 25683840. Its totient is φ = 1912896.

The previous prime is 7664219. The next prime is 7664227. The reversal of 7664220 is 224667.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7664227) 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 47 ways as a sum of consecutive naturals, for example, 92299 + ... + 92381.

It is an arithmetic number, because the mean of its divisors is an integer number (178360).

Almost surely, 2^7664220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7664220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12841920).

7664220 is an abundant number, since it is smaller than the sum of its proper divisors (18019620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7664220 is a wasteful number, since it uses less digits than its factorization.

7664220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 7664220 is about 2768.4327696370. The cubic root of 7664220 is about 197.1617454222.

Adding to 7664220 its reverse (224667), we get a palindrome (7888887).

The spelling of 7664220 in words is "seven million, six hundred sixty-four thousand, two hundred twenty".