7645521 has 8 divisors (see below), whose sum is σ = 10978240. Its totient is φ = 4704912.

The previous prime is 7645513. The next prime is 7645523. The reversal of 7645521 is 1255467.

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

It is not a de Polignac number, because 7645521 - 2³ = 7645513 is a prime.

It is a super-2 number, since 2×7645521² = 116907982722882, which contains 22 as substring.

7645521 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7645523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97981 + ... + 98058.

It is an arithmetic number, because the mean of its divisors is an integer number (1372280).

Almost surely, 2^7645521 is an apocalyptic number.

It is an amenable number.

7645521 is a deficient number, since it is larger than the sum of its proper divisors (3332719).

7645521 is a wasteful number, since it uses less digits than its factorization.

7645521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196055.

The product of its digits is 8400, while the sum is 30.

The square root of 7645521 is about 2765.0535257025. The cubic root of 7645521 is about 197.0012711746.

The spelling of 7645521 in words is "seven million, six hundred forty-five thousand, five hundred twenty-one".