7645220 has 96 divisors (see below), whose sum is σ = 19353600. Its totient is φ = 2505600.

The previous prime is 7645219. The next prime is 7645237. The reversal of 7645220 is 225467.

It is a self number, because there is not a number n which added to its sum of digits gives 7645220.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 129551 + ... + 129609.

It is an arithmetic number, because the mean of its divisors is an integer number (201600).

Almost surely, 2^7645220 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 7645220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9676800).

7645220 is an abundant number, since it is smaller than the sum of its proper divisors (11708380).

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

7645220 is a wasteful number, since it uses less digits than its factorization.

7645220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 7645220 is about 2764.9990958407. Note that the first 3 decimals coincide. The cubic root of 7645220 is about 196.9986858631.

The spelling of 7645220 in words is "seven million, six hundred forty-five thousand, two hundred twenty".